How to add a timer in a C++ program [closed] - c++

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I'm making a game in C++ i.e. hangman in which for entering each letter as an input I want to give user a time limit of 20 seconds. In those 20 seconds if input letter is not given then program ends with display "Time is up".
Remember 'while the timer is running' I want to give input letter.
Is that possible?
Please help through code implementation.

Answer 1

If your platform has conio.h available and your compiler supports C++11 (including <chrono>) you can do it like this:
#include <iostream>
#include <chrono>
#include <conio.h>
int main(int argc, char* argv[]){
std::chrono::time_point<std::chrono::system_clock> start;
start = std::chrono::system_clock::now(); /* start timer */
while(true){
__int64 secondsElapsed = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now()-start).count();
if(secondsElapsed >= 20){ /* 20 seconds elapsed -> leave main lopp */
break;
}
if(_kbhit()){ /* keypressed */
char c = _getch(); /* get character */
std::cout << c; /* output character to stdout */
}
}
return 0;
}
After 20 seconds are passed the programm terminates - until that, you can enter characters to the console window (tested on Windows 7 with Visual Studio 2012).
See also the documentation for _kbhit(), _getch() and <chrono>.