目的：设计一段有三次输入密码权限的程序，若输入正确，返回"密码正确，请继续操作！";若三次输入后密码仍不正确，则返回"密码错误，请离开系统"
#include<stdio.h>
#include<string.h>
int main(void)
{
    char password[100] = "hello";
    char temp[100];
    int i = 0, count = 1;
    while (count <= 3)
    {
        printf("请输入第%d次密码:", count);
        scanf_s("%s",&temp[100]);
        if (strcmp(password, temp) == 0)
        {
            printf("密码正确，请继续操作！");
            break;
        }
        else if (count == 3)
        {
            printf("密码错误，请离开系统");
            break;
        }
        else
            count++;
    }
   
    return 0;
}

scanf_s("%s",temp,100);

#include<stdio.h>
#include<string.h>
int main(void)
{
    char password[100] = "hello";
    char temp[100];
    int i = 0, count = 1;
    while (count <= 3)
    {

        printf("请输入第%d次密码:", count);
       scanf_s("%s",temp,100);
        if (strcmp(password, temp) == 0)
        {
            printf("密码正确，请继续操作！");
            break;
        }
        else if (count == 3)
        {
            printf("密码错误，请离开系统");
            break;
        }
        else
            count++;
    }
    return 0;
}

[此贴子已经被作者于2018-8-21 23:42编辑过]

scanf_s() 格式错误，第一个参数是格式说明符，第二个参数是字符数组首地址，第三个参数是读取字符串长度（含'\0'）。

[此贴子已经被作者于2018-8-21 23:42编辑过]