#define _CRT_SECURE_NO_WARNINGS
#include<conio.h>

#include<graphics.h>
#include<conio.h>
#include<Windows.h>
#define High 480
#define Width 640
int main()
{
	float ball_x, ball_y;
	float ball_vx, ball_vy;
	float radius;

	initgraph(Width, High);
	ball_x = Width / 2;
	ball_y = High / 2;
	ball_vx = 1;
	ball_vy = 1;
	radius = 20;

	while (1)
	{
		setcolor(BLACK);
		setfillcolor(BLACK);
		fillcircle(ball_x, ball_y, radius);

		ball_x = ball_x + ball_vx;
		ball_y = ball_y + ball_vy;

		if ((ball_x <= radius) || (ball_x >= Width - radius))
			ball_vx = -ball_vx;
		if ((ball_y <= radius) || (ball_y) >= High - radius)
			ball_vy = -ball_vy;

		setcolor(YELLOW);
		setfillcolor(GREEN);
		fillcircle(ball_x, ball_y, radius);
		Sleep(8);
	}
	_getch();
	closegraph();
	return 0;
}