#include<bits/stdc++.h>//倒计时
#include<windows.h> 
#include<conio.h>
using namespace std;
void TopWindow(HWND &hWnd) {SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}
int colour(int n){switch(rand()%70){case 0: system("color A0");break;case 1: system("color B0");break;case 2: system("color C0");break;case 3: system("color D0");break;case 4: system("color E0");break;case 5: system("color F0");break;case 6: system("color A1");break;case 7: system("color B1");break;case 8: system("color C1");break;case 9: system("color D1");break;case 10: system("color E1");break;case 11: system("color F1");break;case 12: system("color A2");break;case 13: system("color B2");break;	case 14: system("color C2");break;case 15: system("color D2");break;case 16: system("color E2");break;case 17: system("color F2");break;case 18: system("color A3");break;case 19: system("color B3");break;case 20: system("color C3");break;case 21: system("color D3");break;case 22: system("color E3");break;case 23: system("color F3");break;case 24: system("color A4");break;case 25: system("color B4");break;case 26: system("color C4");break;case 27: system("color D4");break;case 28: system("color E4");break;	case 29: system("color F4");break;case 30: system("color A5");break;case 31: system("color B5");break;case 32: system("color C5");break;case 33: system("color D5");break;case 34: system("color E5");break;case 35: system("color F5");break;case 36: system("color A6");break;			case 37: system("color B6");break;			case 38: system("color C6");break;case 39: system("color D6");break;case 40: system("color E6");break;case 41: system("color F6");break;case 42: system("color A7");break;case 43: system("color B7");break;case 44: system("color C7");break;case 45: system("color D7");break;case 46: system("color E7");break;case 47: system("color F7");break;case 48: system("color A8");break;case 49: system("color B8");break;case 50: system("color C8");break;case 51: system("color D8");break;case 52: system("color E8");break;			case 53: system("color F8");break;case 54: system("color A9");break;case 55: system("color B9");break;case 56: system("color C9");break;case 57: system("color D9");break;case 58: system("color E9");break;case 59: system("color F9");break;}
}
int main(){EnableMenuItem(GetSystemMenu(GetConsoleWindow(), FALSE), SC_CLOSE, MF_GRAYED);HWND hWnd=GetForegroundWindow();char a;int n;cout<<" __________________________ \n";cout<<"|         使用方法         |\n";cout<<"|1.如果中途要暂停，请按下F2|\n";cout<<"|键。                      |\n";cout<<"|2.倒计时数字以秒算，可以以|\n";cout<<"|小时，分钟，秒输入。      |\n";cout<<"|3.需要选择问题的选项。    |\n";cout<<"|4.100秒时会闪烁,50秒会更快|\n";cout<<"|5.最后加上关机脚本，一分钟|\n";cout<<"|后关机，请打开cmd，输入“ |\n";cout<<"|shutdown -a”即可解除（先 |\n";cout<<"|记入下来）。              |\n";cout<<"|6.感谢您的使用！          |\n";cout<<" ￣￣￣￣￣￣￣￣￣￣￣￣￣ \n";system("pause");cout<<"倒计时多少(单位)？\n1、小时\n2、分钟\n3、秒\n";a=getch();if(a=='1') cout<<"倒计时多少小时？\n",cin>>n,n*=3600;if(a=='2') cout<<"倒计时多少分钟？\n",cin>>n,n*=60;if(a=='3') cout<<"倒计时多少秒？\n",cin>>n; system("cls");system("mode con cols=14 lines=3  ");while(n){ if(n>=100){cout<<"还有";cout<<n;n--;cout<<"秒";for(int i=1;i<=10;i++){TopWindow(hWnd);Sleep(10);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(50);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(40);}system("cls");}if(n<100&&n>=50){cout<<"还有";cout<<n;n--;cout<<"秒";for(int i=1;i<=2;i++){for(int j=1;j<=5;j++){TopWindow(hWnd);Sleep(10);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(50);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(40);}colour(n);}system("cls");}if(n<50&&n>=0){if(n==3)  system("mode con cols=50 lines=15  ");cout<<"还有";cout<<n;n--;cout<<"秒";for(int i=1;i<=5;i++){TopWindow(hWnd);Sleep(10);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(50);if(GetAsyncKeyState(VK_F2)){system("pause");}Sleep(40);colour(n);}system("cls");}}system("shutdown -a");system("shutdown -s -t 60 -c 时间到！一分钟后关机。");exit(0);
}

自己做的别的