#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
void cir_mid(int r)
{
int x=0,y=r;
int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"c:\\tc\\bgi");
int d=1-r;
line(0,240,639,240);
line(320,0,320,479);
putpixel(320+x,240-y,5);
while(x<y)
{...