Bouncing Ball using C Program

C Program

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void main() {
	int gd = DETECT, gm = DETECT;
	int x, y = 0, j, t = 400, c = 1;
	initgraph(&gd, &gm, "");
	setcolor(RED);
	setfillstyle(SOLID_FILL, RED);
	for (x = 40; x < 602; x++) {
		cleardevice();
		circle(x, y, 30);
		floodfill(x, y, RED);
		delay(40);
		if (y >= 400) {
			c = 0;
			t -= 20;
		}
		if (y <= (400 - t))
			    c = 1;
		y = y + (c ? 15 : -15);
	}
	getch();
}