自己实现strcat

strcat

函数原型：char* strcat (char*, const char*);

    char *my_str_cat(char* p_des, const char* p_src)
    {
        if (NULL == p_des || NULL == p_src)
        {
            return p_des;
        }
        char *p_des_head = p_des;
        while(*p_des)
        {
            p_des++;
        }
        while(*p_src)
        {
            *p_des = *p_src;
            p_des++;
            p_src++;
        }
        *p_des = '\0';

        return p_des_head;
    }

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C语言中strcat()函数和strcpy()函数的用法

1 strcpy原型声明：extern char *strcpy(char* dest, const char *src);头文件：#include <string.h>功能：把从src地址开始且含有NULL