##Collision Of two balls In C Graphics

#include<graphics.h>
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<dos.h>
int main()
{
  int gd=DETECT,gm,i,j,x2=500,x1=100,y=300;
  initgraph(&gd,&gm,"c://turboc3//bgi");
  for (i=0;x2-x1!=100;i++)
  {
   setcolor(RED);
   circle(x1=100 + i,y=300,50);
   delay(50);
   circle(x2=500 - i,300,50);
   if(x2-x1!=100){
  setcolor(BLACK);
  circle(x1=100+i,y=300,50);
  circle(x2=500-i,y=300,50);
 }
 }

  getch();
  closegraph();
  return 0;
}