#include<stdio.h>

#include<string.h>                                                                                     \\因为下面会用到strcmp函数 比较两个数组大小

                                                                                                                      所以要加上其头文件

main()

{

 char a[10],b[10];                                                                                      \\账号和密码都定义为字符数组比较方便

 loop:printf("请输入账号\n");                                                                        \\在此做了一个loop的标号

 gets(a);

 printf("请输入密码\n");                                                                                  

 gets(b);

 if(strcmp(a,"shujun")==0 && strcmp(b,"sj7332124")==0)                            \\判断账号密码的正确性,

    {

 printf("登陆成功\n");

 }

    else {                                                                                                   \\如果密码错误则输出账号密码错误,

                                                                                                                   并且跳转到loop标号下重新输入账号密码

 printf("账号密码错误\n");

 goto loop;

    }

    return 0;

}