C语言 用strcpy()函数……(103)

#include <stdio.h>void main(){char s1[81],s2[81],s3[81];printf("please input first string:\n");gets(s1);printf("please input second string:\n");gets(s2);strcpy(s3,s1);strcpy(s1,s2);strcpy(s2,s3);printf("\n");printf("the first string is:");puts(s1);printf("the second string is:");puts(s2);} 收起