#include <stdio.h>
#include <windows.h>

main()
{
    int total_time, hour, minute, second;
    printf("please set time(hour,minute,second) :\n");
    scanf("%d%d%d",&hour, &minute, &second);
    printf("time is %d:%d:%d\n",hour, minute, second);
    total_time = hour * 3600 + minute * 60 + second;
    printf("total time is:%d\n",total_time);

    while(total_time != 0) {
        hour = total_time / 3600;
        minute = (total_time - hour * 3600) / 60;
        second = (total_time - hour * 3600) % 60;
        total_time --;
        Sleep(1000);
        system("cls");
        printf("time is %d:%d:%d\n",hour, minute, second);
        
    }
        /*Sleep(1000);
        system("cls");
    printf("time is over! BOOM!!!!\n");*/
   
    return 0;
}


结果显示老是还剩一秒“0:0:1”，而不是我想要的“0：0：0”！

#include <stdio.h>
#include <windows.h>

main()
{
    int total_time, hour, minute, second;
    printf("please set time(hour,minute,second) :\n");
    scanf("%d%d%d",&hour, &minute, &second);
    printf("time is %d:%d:%d\n",hour, minute, second);
    total_time = hour * 3600 + minute * 60 + second;
    printf("total time is:%d\n",total_time);

    while(total_time >= 0) {    //total_time != 0 说明执行到total_time = 0时，不执行语句块。
        hour = total_time / 3600;
        minute = (total_time - hour * 3600) / 60;
        second = (total_time - hour * 3600) % 60;
        total_time--;
        Sleep(1000);
        system("cls");
        printf("time is %d:%d:%d\n",hour, minute, second);
        
    }
 
    return 0;
}


[ 本帖最后由 荡气回肠 于 2012-5-25 21:20 编辑 ]

对的，哈哈，谢谢

下次遇到问题的时候可以先自己调试运行一下，像这种错误一经调试马上就可以发现问题的所在。

#include<stdio.h>
#include<windows.h>

void main(){
    int hour = 0;
    int minute = 0;
    int second = 0;
    int toal = 0;

    printf("请设置(小时，分钟，秒):");
    scanf("%d%d%d", &hour, &minute, &second);
    printf("时间是:%d : %d : %d", hour, minute, second);

    toal = 3600 * hour + 60 * minute + second;

    while(toal >= 0){
        hour = toal / 3600;
        minute = (toal - 3600 * hour) / 60;
        second = (toal - 3600 * hour) % 60;

        toal--;
        Sleep(1000);
        system("cls");

        printf("时间还剩:%d : %d : %d", hour, minute, second);
    }
    printf("\n时间到了！");
}

将循环改为：while(toal >= 0);因为当toal = 0 时如果是你的判断条件将不会执行！