结构体中指针赋值问题的分析及C代码示例

来源：互联网发布：西语助手mac版编辑：程序博客网时间：2024/05/17 00:18

问题描述
某结构体的定义如下：

<code class="hljs d has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">typedef</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span>{    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>     iAge;                <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 年龄</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">char</span>    szAddr1[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>];        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 地址1</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">char</span>   *pszAddr2;            <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 地址2</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">char</span>  **pszAddr3;            <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 地址3</span>} T_PeopleInfo;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

请问如何对结构体中的各个成员变量(尤其是指针变量)进行赋值？

问题分析及C代码示例
我们可以看到，在结构体T_PeopleInfo中，pszAddr2和pszAddr3均为指针，其中pszAddr2为一级指针，pszAddr3为二级指针。本文的重点，就是要找到对一级指针和二级指针赋值的正确方法。

我们把结构体T_PeopleInfo放到具体的C代码中，以直观地展现对结构体中的各个成员变量的赋值方法。

我们首先编写如下程序(程序1)：

<code class="hljs markdown has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>版权所有 (C)2016, Zhou Zhaoxiong。<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件名称：PointerTest.c<span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件标识：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>内容摘要：演示指针的用法<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其它说明：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>当前版本：V1.0<span class="hljs-bullet" style="box-sizing: border-box;">* </span>作    者：Zhou Zhaoxiong<span class="hljs-bullet" style="box-sizing: border-box;">* </span>完成日期：20160712<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span>/<span class="hljs-header" style="box-sizing: border-box;">#include <stdio.h></span>// 重定义数据类型typedef signed   int        INT32;typedef unsigned int        UINT32;typedef unsigned char       UINT8;// 结构体定义typedef struct{<span class="hljs-code" style="box-sizing: border-box;">    UINT32   iAge;                    // 年龄</span><span class="hljs-code" style="box-sizing: border-box;">    UINT8    szAddr1[100];            // 地址1</span><span class="hljs-code" style="box-sizing: border-box;">    UINT8   *pszAddr2;                // 地址2</span><span class="hljs-code" style="box-sizing: border-box;">    UINT8  **pszAddr3;                // 地址3</span>} T_PeopleInfo;/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*<span class="hljs-bullet" style="box-sizing: border-box;">* </span>功能描述: 主函数<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输入参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输出参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>返 回 值: 0-执行完成<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其他说明: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>修改日期       版本号        修改人        修改内容<span class="hljs-bullet" style="box-sizing: border-box;">* </span>-------------------------------------------------------------<span class="hljs-bullet" style="box-sizing: border-box;">* </span>20160712        V1.0     Zhou Zhaoxiong     创建<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*/INT32 main(void){<span class="hljs-code" style="box-sizing: border-box;">    T_PeopleInfo tPeopleInfo = {0};</span><span class="hljs-code" style="box-sizing: border-box;">    // 结构体变量赋值</span><span class="hljs-code" style="box-sizing: border-box;">    // 对iAge赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.iAge = 10;</span><span class="hljs-code" style="box-sizing: border-box;">    // 对szAddr1赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.szAddr1, "Chongqing, China!", strlen("Chongqing, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr2赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.pszAddr2, "Chengdu, China!", strlen("Chengdu, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr3赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.pszAddr3, "Wuhan, China!", strlen("Wuhan, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 打印变量的值</span><span class="hljs-code" style="box-sizing: border-box;">    printf("Age=%d, Addr1=%s, Addr2=%s, Addr3=%s", tPeopleInfo.iAge, tPeopleInfo.szAddr1, tPeopleInfo.pszAddr2, tPeopleInfo.pszAddr3);</span><span class="hljs-code" style="box-sizing: border-box;">    return 0;</span>}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li></ul>

在程序1中，我们按照对结构体中的数组的赋值方法对指针赋值，程序可以编译通过，但运行的时候，程序便会挂掉。究其原因，是因为没有为pszAddr2和pszAddr3指针分配内存空间。

我们对程序1进行改进，编写出以下程序(程序2)：

<code class="hljs markdown has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>版权所有 (C)2016, Zhou Zhaoxiong。<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件名称：PointerTest.c<span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件标识：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>内容摘要：演示指针的用法<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其它说明：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>当前版本：V1.0<span class="hljs-bullet" style="box-sizing: border-box;">* </span>作    者：Zhou Zhaoxiong<span class="hljs-bullet" style="box-sizing: border-box;">* </span>完成日期：20160712<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span>/<span class="hljs-header" style="box-sizing: border-box;">#include <stdio.h></span>// 重定义数据类型typedef signed   int        INT32;typedef unsigned int        UINT32;typedef signed   char       INT8;// 结构体定义typedef struct{<span class="hljs-code" style="box-sizing: border-box;">    UINT32   iAge;                    // 年龄</span><span class="hljs-code" style="box-sizing: border-box;">    INT8     szAddr1[100];            // 地址1</span><span class="hljs-code" style="box-sizing: border-box;">    INT8    *pszAddr2;                // 地址2</span><span class="hljs-code" style="box-sizing: border-box;">    INT8   **pszAddr3;                // 地址3</span>} T_PeopleInfo;/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*<span class="hljs-bullet" style="box-sizing: border-box;">* </span>功能描述: 主函数<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输入参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输出参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>返 回 值: 0-执行完成<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其他说明: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>修改日期       版本号        修改人        修改内容<span class="hljs-bullet" style="box-sizing: border-box;">* </span>-------------------------------------------------------------<span class="hljs-bullet" style="box-sizing: border-box;">* </span>20160712        V1.0     Zhou Zhaoxiong     创建<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*/INT32 main(void){<span class="hljs-code" style="box-sizing: border-box;">    T_PeopleInfo tPeopleInfo = {0};</span><span class="hljs-code" style="box-sizing: border-box;">    // 结构体变量赋值</span><span class="hljs-code" style="box-sizing: border-box;">    // 对iAge赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.iAge = 10;</span><span class="hljs-code" style="box-sizing: border-box;">    // 对szAddr1赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.szAddr1, "Chongqing, China!", strlen("Chongqing, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr2赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr2 = (INT8 *)malloc(100);</span><span class="hljs-code" style="box-sizing: border-box;">    if (tPeopleInfo.pszAddr2 == NULL)</span><span class="hljs-code" style="box-sizing: border-box;">    {</span><span class="hljs-code" style="box-sizing: border-box;">        return -1;</span><span class="hljs-code" style="box-sizing: border-box;">    }</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.pszAddr2, "Chengdu, China!", strlen("Chengdu, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr3赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr3 = (INT8 *)malloc(100);</span><span class="hljs-code" style="box-sizing: border-box;">    if (tPeopleInfo.pszAddr3 == NULL)</span><span class="hljs-code" style="box-sizing: border-box;">    {</span><span class="hljs-code" style="box-sizing: border-box;">        return -2;</span><span class="hljs-code" style="box-sizing: border-box;">    }</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.pszAddr3, "Wuhan, China!", strlen("Wuhan, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 打印变量的值</span><span class="hljs-code" style="box-sizing: border-box;">    printf("Age=%d, Addr1=%s, Addr2=%s, Addr3=%s\n", tPeopleInfo.iAge, tPeopleInfo.szAddr1, tPeopleInfo.pszAddr2, tPeopleInfo.pszAddr3);</span><span class="hljs-code" style="box-sizing: border-box;">    return 0;</span>}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li></ul>

在程序2中，我们先使用malloc为pszAddr2和pszAddr3分配了内存空间(注意，执行malloc之后，要判断指针是否为空)，此时就可以将变量值赋给它们。程序编译和运行都是正常的，输出结果如下：

~/zhouzx/Test/PointerTest> PointerTest
Age=10, Addr1=Chongqing, China!, Addr2=Chengdu, China!, Addr3=Wuhan, China!

除了程序2可以实现对一级指针和二级指针的正常赋值之外，我们还可以编写如下程序(程序3)：

<code class="hljs markdown has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>版权所有 (C)2016, Zhou Zhaoxiong。<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件名称：PointerTest.c<span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件标识：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>内容摘要：演示指针的用法<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其它说明：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>当前版本：V1.0<span class="hljs-bullet" style="box-sizing: border-box;">* </span>作    者：Zhou Zhaoxiong<span class="hljs-bullet" style="box-sizing: border-box;">* </span>完成日期：20160712<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span>/<span class="hljs-header" style="box-sizing: border-box;">#include <stdio.h></span>// 重定义数据类型typedef signed   int        INT32;typedef unsigned int        UINT32;typedef signed   char       INT8;// 结构体定义typedef struct{<span class="hljs-code" style="box-sizing: border-box;">    UINT32   iAge;                    // 年龄</span><span class="hljs-code" style="box-sizing: border-box;">    INT8     szAddr1[100];            // 地址1</span><span class="hljs-code" style="box-sizing: border-box;">    INT8    *pszAddr2;                // 地址2</span><span class="hljs-code" style="box-sizing: border-box;">    INT8   **pszAddr3;                // 地址3</span>} T_PeopleInfo;/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*<span class="hljs-bullet" style="box-sizing: border-box;">* </span>功能描述: 主函数<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输入参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输出参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>返 回 值: 0-执行完成<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其他说明: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>修改日期       版本号        修改人        修改内容<span class="hljs-bullet" style="box-sizing: border-box;">* </span>-------------------------------------------------------------<span class="hljs-bullet" style="box-sizing: border-box;">* </span>20160712        V1.0     Zhou Zhaoxiong     创建<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*/INT32 main(void){<span class="hljs-code" style="box-sizing: border-box;">    T_PeopleInfo tPeopleInfo = {0};</span><span class="hljs-code" style="box-sizing: border-box;">    // 结构体变量赋值</span><span class="hljs-code" style="box-sizing: border-box;">    // 对iAge赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.iAge = 10;</span><span class="hljs-code" style="box-sizing: border-box;">    // 对szAddr1赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.szAddr1, "Chongqing, China!", strlen("Chongqing, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr2赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr2 = "Chengdu, China!";</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr3赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr3 = "Wuhan, China!";</span><span class="hljs-code" style="box-sizing: border-box;">    // 打印变量的值</span><span class="hljs-code" style="box-sizing: border-box;">    printf("Age=%d, Addr1=%s, Addr2=%s, Addr3=%s\n", tPeopleInfo.iAge, tPeopleInfo.szAddr1, tPeopleInfo.pszAddr2, tPeopleInfo.pszAddr3);</span><span class="hljs-code" style="box-sizing: border-box;">    return 0;</span>}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li></ul>

在程序3中，我们直接将字符串赋给了pszAddr2和pszAddr3，也就是将这两个字符串的首地址赋给了指针。那么，指针所指向的地址中存放的内容就是字符串的值。程序编译和运行都是正常的，输出结果如下：

~/zhouzx/Test/PointerTest> PointerTest
Age=10, Addr1=Chongqing, China!, Addr2=Chengdu, China!, Addr3=Wuhan, China!

另，对于二级指针的赋值，我们还可以编写如下程序(程序4)：

<code class="hljs markdown has-numbering" style="display: block; padding: 0px; background: transparent; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal;">/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>版权所有 (C)2016, Zhou Zhaoxiong。<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件名称：PointerTest.c<span class="hljs-bullet" style="box-sizing: border-box;">* </span>文件标识：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>内容摘要：演示指针的用法<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其它说明：无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>当前版本：V1.0<span class="hljs-bullet" style="box-sizing: border-box;">* </span>作    者：Zhou Zhaoxiong<span class="hljs-bullet" style="box-sizing: border-box;">* </span>完成日期：20160712<span class="hljs-bullet" style="box-sizing: border-box;">*</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span>/<span class="hljs-header" style="box-sizing: border-box;">#include <stdio.h></span>// 重定义数据类型typedef signed   int        INT32;typedef unsigned int        UINT32;typedef signed   char       INT8;// 结构体定义typedef struct{<span class="hljs-code" style="box-sizing: border-box;">    UINT32   iAge;                    // 年龄</span><span class="hljs-code" style="box-sizing: border-box;">    INT8     szAddr1[100];            // 地址1</span><span class="hljs-code" style="box-sizing: border-box;">    INT8    *pszAddr2;                // 地址2</span><span class="hljs-code" style="box-sizing: border-box;">    INT8   **pszAddr3;                // 地址3</span>} T_PeopleInfo;/<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*<span class="hljs-bullet" style="box-sizing: border-box;">* </span>功能描述: 主函数<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输入参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>输出参数: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>返 回 值: 0-执行完成<span class="hljs-bullet" style="box-sizing: border-box;">* </span>其他说明: 无<span class="hljs-bullet" style="box-sizing: border-box;">* </span>修改日期       版本号        修改人        修改内容<span class="hljs-bullet" style="box-sizing: border-box;">* </span>-------------------------------------------------------------<span class="hljs-bullet" style="box-sizing: border-box;">* </span>20160712        V1.0     Zhou Zhaoxiong     创建<span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-strong" style="box-sizing: border-box;">*****</span><span class="hljs-emphasis" style="box-sizing: border-box;">***</span>*/INT32 main(void){<span class="hljs-code" style="box-sizing: border-box;">    T_PeopleInfo tPeopleInfo = {0};</span><span class="hljs-code" style="box-sizing: border-box;">    // 结构体变量赋值</span><span class="hljs-code" style="box-sizing: border-box;">    // 对iAge赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.iAge = 10;</span><span class="hljs-code" style="box-sizing: border-box;">    // 对szAddr1赋值</span><span class="hljs-code" style="box-sizing: border-box;">    strncpy(tPeopleInfo.szAddr1, "Chongqing, China!", strlen("Chongqing, China!"));</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr2赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr2 = "Chengdu, China!";</span><span class="hljs-code" style="box-sizing: border-box;">    // 对pszAddr3赋值</span><span class="hljs-code" style="box-sizing: border-box;">    tPeopleInfo.pszAddr3 = (INT8 *)malloc(100);</span><span class="hljs-code" style="box-sizing: border-box;">    if (tPeopleInfo.pszAddr3 == NULL)</span><span class="hljs-code" style="box-sizing: border-box;">    {</span><span class="hljs-code" style="box-sizing: border-box;">        return -1;</span><span class="hljs-code" style="box-sizing: border-box;">    }</span><span class="hljs-code" style="box-sizing: border-box;">    *(tPeopleInfo.pszAddr3) = "Wuhan, China!";</span><span class="hljs-code" style="box-sizing: border-box;">    // 打印变量的值</span><span class="hljs-code" style="box-sizing: border-box;">    printf("Age=%d, Addr1=%s, Addr2=%s, Addr3=%s\n", tPeopleInfo.iAge, tPeopleInfo.szAddr1, tPeopleInfo.pszAddr2, *(tPeopleInfo.pszAddr3));</span><span class="hljs-code" style="box-sizing: border-box;">    return 0;</span>}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right: 1px solid rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; 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padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li></ul>

在程序4中，我们先用malloc为pszAddr3分配了内存空间，然后便可以使用该指针来接收字符串变量的值(注意，这里是将“Wuhan, China!”赋给了*(tPeopleInfo.pszAddr3))。程序编译和运行都是正常的，输出结果如下：

~/zhouzx/Test/PointerTest> PointerTest
Age=10, Addr1=Chongqing, China!, Addr2=Chengdu, China!, Addr3=Wuhan, China!

总结
本文对结构体中指针赋值问题进行了分析，并用C代码演示了指针的赋值方法。

在实际的C语言项目中，很多程序出现问题，就是对指针的处理不当造成的。因此，熟练掌握各种指针的使用方法，是对一个合格的软件开发人员的基本要求。

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