复制字符串

#include <stdio.h>char *str_copy(char *d, const char *s){char *t=d;while(*d++ = *s++){;}return (t);}void main(){char s1[100];char s2[100];printf("请输入一个字符串"); scanf("%s",s1);str_copy(s2,s1);puts("将s1复制到了s2");printf("s1=%s\n",s1);printf("s2=%s\n",s2);putchar('\n');}