C / C++ / MFC

#include <iostream>
#include <conio.h>
#include <ctime>
using namespace std;

time_t	g_Time = 0;
unsigned int g_uInterval;

void SetTimeout(unsigned int uX)
{
	g_uInterval = uX;
}

void Begin()
{
	g_Time = time(0);
}

bool IsTimeout()
{
	if( g_uInterval < difftime(time(0), g_Time) )
		return true;
	return false;
}

void main()
{
	unsigned int uX = 20;
	cout << "Press any key in " << uX << " sec.\n";
	SetTimeout(20);
	Begin();
	while(1)
	{
		if(_kbhit()) {
			cout << "Key pressed.\n";
			break;
		}
		if(IsTimeout()) {
			cout << "Time out.\n";
			return;
		}
	}
	getch();
}