字符串copy

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>



//字符串copy操作

//字符串copy函数
void copy_str21(char *from,char *to)
{
    for (; *from != ''; from++, to++)
    {
        *to = *from;
    }
    *to = '';
    return;
}
void copy_str22(char *from,char *to)
{
    while(*to++ = *from++);
}
int main()
{
    char *from ="abcdefg";
    char buf2[100];
    /*copy_str21(from,buf2);
    printf("buf2:%s
",buf2);*/
    copy_str22(from, buf2);
    printf("buf2:%s
", buf2);
    system("pause");
    return 0;
}