程序代码：

#define _CRT_SECURE_NO_WARNINGS

#include <bits/stdc++.h>
#include <windows.h>

#pragma comment(lib, "winmm.lib")

#include <Mmsystem.h>
#include <conio.h>

using namespace std;

void play() // 播放
{
    char File[] = "C:\\Windows\\Media\\Ring06.wav";
    PlaySoundA(File, NULL, SND_FILENAME | SND_ASYNC | SND_LOOP);
    cout << "按任意键关闭语音" << endl;
    while (!_kbhit())
        Sleep(500);
    PlaySoundA(NULL, NULL, SND_FILENAME | SND_ASYNC | SND_LOOP);
}

int main()
{
    int sec;
    char buf[20] = {0};
    cout << "输入倒计时(秒)：";
    cin >> sec;
    while (sec >= 0)
    {
        sprintf(buf, "\b\b%02d", sec);
        cout << buf;
        sec--;
        Sleep(1000);
    }
    cout << "\n时间到！" << endl;

    play();

    return 0;
}