#include <conio.h> // getch() kbhit()
#include <time.h>

#define FALSE (0)
#define TRUE (!FALSE)

int main(void)
{
	int x, y;
	int vx, vy;
	int i, j;
	int stayinloop;
	int cmd;

	int row, col;

	clock_t start, now;

	for(x = 2; x < 78; x++)
	{
		gotoxy(x, 2);
		putch('-');
		gotoxy(x, 22);
		putch('-');
	}

	for(y = 2; y < 22; y++)
	{
		gotoxy(2, y);
		putch('|');
		gotoxy(78, y);
		putch('|');
	}

	x=40; y=4;

	vx = -1; vy = 1;

	start = clock();
	stayinloop = TRUE;
	while(stayinloop)
	{
		now = clock();
		if(kbhit())
			cmd = getch();

		switch(cmd)
		{
			case 'q':
			case 'Q':
				stayinloop = FALSE;
				break;
		}
		if(now > start + 5)
		{
			gotoxy(x,y);
			putch(' ');
			x += vx;
			y += vy;
			if((x < 2) || (x > 78))
				vx *= -1;
			if((y < 2) || (y > 22))
				vy *= -1;
			gotoxy(x,y);
			putch('*');
         start = now;
		}
	}

	return(0);
}