// C++程序隐藏和显示控制台窗口
#include <iostream>
#include <windows.h>
using namespace std;
void countdown()
{
    cout << "3" << endl;
    Sleep(1000);
    cout << "2" << endl;
    Sleep(1000);
    cout << "1" << endl;
    Sleep(1000);
    cout << "0" << endl;
}
int main()
{
    countdown();
    HWND window;
    AllocConsole();
    window = FindWindowA("ConsoleWindowClass", NULL);
    ShowWindow(window, 0);
    countdown();
    ShowWindow(window, 1);
}