Program for Concentric Circles Generation using midpoint algorithm

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void draw_circle(int,int,int);

void symmetry(int,int,int,int);

void main(){

int xc,yc,R;

int driver,mode;

driver = DETECT;

initgraph(&driver,&mode,"c:\\tc\\bgi");

printf("Enter the center of the circle:\n");

printf("Xc =");

scanf("%d",&xc);

printf("Yc =");

scanf("%d",&yc);

printf("Enter the radius of the circle :");

scanf("%d",&R);

draw_circle(xc,yc,R);

getch();

closegraph();

}

void draw_circle(int xc,int yc,int rad){

int x = 0;

int y = rad;

int p = 1-rad;

symmetry(x,y,xc,yc);

for(x= 0;y>x;x++) {

 if(p<0)

 p += 2*x + 3;

 else {

 p += 2*(x-y) + 5;

 y--;

 }

 symmetry(x,y,xc,yc);

 }

}

void symmetry(int x,int y,int xc,int yc){

putpixel(xc+x,yc-y,EGA_WHITE);

putpixel(xc+y,yc-x,EGA_WHITE);

putpixel(xc+y,yc+x,EGA_WHITE);

putpixel(xc+x,yc+y,EGA_WHITE);

putpixel(xc-x,yc+y,EGA_WHITE);

putpixel(xc-y,yc+x,EGA_WHITE);

putpixel(xc-y,yc-x,EGA_WHITE);

putpixel(xc-x,yc-y,EGA_WHITE);

}

OUTPUT