可以与C ++中的程序同时倒计时

Question

I am currently making a quiz program. And I created a countdown, but as c++ does actions line by line I am getting what I want. I want countdown work simultaneously with the tests.

here is the one part of my program

void QUIZ::OOP2()
{
system("cls");
QUIZ("OOP2");
int oop2_time = 100;
for (int i = oop2_time; oop2_time >= 0; i--)
{
cout << "\t\t\tQuestions of OOP2\n\n";
line();
cout << "1. Switch selection structure can be used to represent any kind of if-else selection structure? \n";
line();
cout << " a) True b) False \n";

CorrectB(var);
if (oop2_time == 100)
{
cout << "You have the remaining" << oop2_time << "seconds \n" << endl;
Sleep(40000);
}
if (oop2_time == 60)
{
cout << "You have the remaining" << oop2_time << "seconds \n" << endl;
Sleep(30000);
}
if (oop2_time == 30)
{
cout << "You have the remaining" << oop2_time << "seconds \n" << endl;
Sleep(15000);
}
if (oop2_time == 15)
{
cout << "You have the remaining" << oop2_time << "seconds \n" << endl;
Sleep(10000);
}
if (oop2_time == 5)
{
cout << "You have the remaining" << oop2_time << "seconds \n" << endl;
Sleep(5000);
cout << "\nTime is out\n";
goback();
intro();
}

result("OOP2");
goback();
}
}

Answer 1

Without using multi-threading or std::chrono but just your base code, here's a code snippet. I have used recursive function and a time resolution of 1 second. The countdown can also be terminated prematurely in the main by setting stop = true; :

#include <iostream>
#include <windows.h>

void wait(double sec, bool& stop)
{
    std::cout <<"Time remaining "<< sec << " sec\n";
    if (stop || sec <= 0) return;
    Sleep(1000);
    wait(sec-1, stop);
}


int main()
{
    bool stop = false;
    wait(5, stop);
}