C实现动态数组

来源：互联网发布：洋葱新闻知乎编辑：程序博客网时间：2024/05/22 06:59

头文件：

#ifndef DYNAMIC_H_INCLUDED#define DYNAMIC_H_INCLUDED#include <stdio.h>#include <stdlib.h>struct data{int *p;//动态数组头指针int length;//动态数组长度};void inidata(struct data *pd);//初始化void adddata(struct data *pd,int num);//动态增加元素void addarray(struct data *pd,int *pp,int len);//动态增加数组void disdata(struct data *pd);//显示#endif // DYNAMIC_H_INCLUDED

源文件：

/***使用的是GCC编译器，个别变量定义有区别***/#include <stdio.h>#include <stdlib.h>#include "dynamic.h"int i;int j;int k;void inidata(struct data *pd){ pd->p = NULL;//动态数组头指针 pd->length = 0;//动态数组长度}void adddata(struct data *pd,int num){    if(pd -> p == NULL)    {        pd->p = (int *)malloc(sizeof(int));        pd->length+=1;        pd->p[pd -> length - 1] = num;    }    else    {        pd -> p = (int *)realloc(pd -> p,(pd->length + 1)*sizeof(int));         pd -> length+=1;        pd -> p[pd -> length - 1] = num;    }}void addarray(struct data *pd,int *pp,int len){    if(pd ->p == NULL)    {        pd -> p = (int *)malloc(sizeof(int)*len);        for(i=0;i < len;i++)        {            pd -> p[pd -> length + i] = pp[i];        }    pd ->length += len;    }    else    {        pd -> p = (int *)realloc(pd -> p,(pd->length+len)*sizeof(int));        for(j=0;j<len;j++)        {            pd -> p[pd -> length + j] = pp[j];        }        pd -> length+=len;    }}void disdata(struct data *pd){    if(pd ->p == NULL)    {       printf("数组为空\n");    }    else    {       for(k=0;k < pd->length;k++)        {            printf("第%d个元素=%d\n",k,pd->p[k]);        }    }}int main(){    int numa[10]={0,1,2,3,4,5,6,7,8,9};   struct data data1;    inidata(&data1);    addarray(&data1,numa,10);     disdata(&data1);    adddata(&data1,10);   adddata(&data1,20);    adddata(&data1,30);    adddata(&data1,30);    disdata(&data1);      adddata(&data1,50);    adddata(&data1,60);    disdata(&data1);    return 0;}

上述代码没有进行内存释放。。欢迎大家自己添加

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