C++ für Dumies Prob

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <conio.h>

int main(int argc, char* argv[])
{
	int key;
	long currentTick, lastTick = GetTickCount();
	
	printf("Press any key to print TickCount; Esc to exit.\n\n");
	do {
		key = _getch();
		
		currentTick = GetTickCount();
		printf("Current TickCount: %d, Time since last keypress: %d, in seconds: %4.3f \n", currentTick, currentTick-lastTick, ((double)currentTick-(double)lastTick)/1000.0);
		lastTick = currentTick;
	} while(key != 27);
	
	return 0;
}