C implementation of Midpoint Circle Drawing Algorithm

Similar to previous post, following is the program for Midpoint Circle Drawing Algorithm in C.

PROGRAM CODE

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

int gd=DETECT,gm,i,x,y,r,xmid,ymid;

float p;

void main()

{

clrscr();

printf("\nEnter radius of circle=");

scanf("%d",&r);

initgraph(&gd,&gm,"c:\\tc\\bgi");

x=0;

y=r;

p=1.25-r;

do

{

xmid=getmaxx()/2;

ymid=getmaxy()/2;

putpixel(xmid+x,ymid+y,15);

putpixel(xmid+y,ymid+x,15);

putpixel(xmid+x,ymid-y,15);

putpixel(xmid+y,ymid-x,15);

putpixel(xmid-x,ymid-y,15);

putpixel(xmid-x,ymid+y,15);

putpixel(xmid-y,ymid+x,15);

putpixel(xmid-y,ymid-x,15);

if(p<0)

{

x=x+1;

y=y;

p=p+2*x+1;

}

else

{

x=x+1;

y=y-1;

p=p+2*(x+1)+1-2*y;

}}while(x<y);

line(xmid,ymid,xmid+r,ymid);

char ch[20];

sprintf(ch,"%d",r);

outtextxy(xmid+(r/2)-10,ymid-10,ch);

outtextxy(getmaxx()-450,getmaxy()-20,"MidPoint Circle Algorithm :Program By 1st Kinecteer");

rectangle(getmaxx()-455,getmaxy()-25,getmaxx()-30,getmaxy()-7);

getch();

}

OUTPUT: