程序代码：

#include<stdio.h>
int main(void)
{
    int a;
    while (scanf("%d", &a), a !=5)
    {
        switch (a)
        {
        case 1: printf("验证为1\n");
            continue;
        case 2: printf("验证为2\n");
            continue;
        case 3: printf("验证为3\n");
            continue;
        case 4: printf("验证为4\n");
            continue;
        default: printf("请输入合适的数字1-5:\n");
        }
    }
    printf("为5时退出\n");
    return(0);
}