C 标准库 strcpy 函数的实现

/*
 * strcpy 拷贝字符串
 */
#include <cstdio>

char * strcpy ( char * destination, const char * source ) {
    char *p = (char *) source;
    while (*destination++=*p++)
        ;

    return p-1;
}


int main ()
{
    char str1[]="Sample string";
    char str2[40];
    char str3[40];
    strcpy (str2,str1);
    strcpy (str3,"copy successful");
    printf ("str1: %s\nstr2: %s\nstr3: %s\n",str1,str2,str3);
    return 0;
}