Linux C 使用指针访问成员

  在Linux用c编程，很多时候都会碰到结构体这个概念，尤其是使用指针访问结构体成员。（下面的文字介绍，请参考代码理解）

        1. 使用一个新运算符：->,这个运算符有一个连接号（-）后跟一个大于符号（>）组成

             struct guy *him;

             him = &fellow[0];

             him->income

 

         2. 如果 him = &fellow[0] ，那么 *him = fellow[0] ,   &和*是一对互逆的运算符，因此可做以下代替：

             fellow[0].income  == (*him).income

             必须有圆括号，因为，运算符比*的优先级更高。

 

          总之，后面跟->运算符的结构指针和后跟 . (点)运算符的结构名是一样的，如果him是指向名为barney的guy类型结构的指针，则下列表达式是等价的：

               barney.income  == (*him).income  == him->income     // 假设 him = &barney

 

         代码：

                1 #include <stdio.h> 2 #define LEN 20 3 4 struct names{ 5 char first[LEN]; 8 11 char favfood[LEN]; 12 char job[LEN]; 13 float income; 14 15 }; 16 17 18 main(){ 19 20 struct guy fellow[2] = { 21 22 {{"Ewen","Villard"},"grilled salmon","personality coach",58112.00}, 23 {{"Rodney","Swillbelly"},"tripe","tabloid editor",232400.00} 24 }; 25 26 struct guy *him; 27 printf("address #1 : %p #2 : %p/n",&fellow[0],&fellow[1]); 28 him = &fellow[0]; 29 printf("pointer #1: %p #2: %p/n",him,him+1); 30 printf("him->income is $%.2f: (*him).income is $%.2f/n",him->income,(*him) .income); 31 him++; 32 printf("him->favfood is %s : him->handle.last is %s /n",him->favfood,him-> handle.last); 33 34 35 }