写一个周期报时的C#代码

循环报时可以使用定时器和if语句来实现，代码如下：

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

int main()
{
    int hour, minute, second;

    while (1) {
        // 获取当前时间
        time_t now = time(NULL);
        struct tm *t = localtime(&now);

        hour = t->tm_hour;
        minute = t->tm_min;
        second = t->tm_sec;

        // 输出当前时间
        printf("%02d:%02d:%02d ", hour, minute, second);

        // 判断是否到整点
        if (minute == 0 && second == 0) {
            for (int i = 0; i < hour; i++) {
                printf("Dong ");
            }
        }

        // 定时器延时1秒
        Sleep(1000);
    }

    return 0;
}

该程序会每秒输出当前时间，并在整点报时时输出对应的“Dong”声，例如：

11:59:50
11:59:51
11:59:52
11:59:53
11:59:54
11:59:55
11:59:56
11:59:57
11:59:58
11:59:59
12:00:00 Dong
12:01:00 Dong Dong
12:02:00 Dong Dong Dong
12:03:00 Dong Dong Dong Dong
12:04:00 Dong Dong Dong Dong Dong
12:05:00 Dong Dong Dong Dong Dong Dong
...