MID POINT ALGORITHM FOR DRAWING CIRCLE

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#include<stdio.h>

#include<math.h>

#include<conio.h>

#include<graphics.h>

void drawCircle(int,int,int);

int main()

{

                int x=300,y=300,r=100,i,j;

                int gmode,gdriver=DETECT;

                initgraph(&gdri

                driver,&gmode,"");

                //circle(x,y,r);

                drawCircle(x,y,r);

                getch();

                return 0;

}

void drawCircle(int x0,int y0,int r)

{

                int x=r,y=0;

                int radiusError=1-x;

                while(x>=y)

                {

                                putpixel(x+x0,y+y0,WHITE);

                                putpixel(y+x0,x+y0,WHITE);

                                putpixel(-x+x0,y+y0,WHITE);

                                putpixel(-y+x0,x+y0,WHITE);

                                putpixel(-x+x0,-y+y0,WHITE);

                                putpixel(-y+x0,-x+y0,WHITE);

                                putpixel(x+x0,-y+y0,WHITE);

                                putpixel(y+x0,-x+y0,WHITE);

                                y++;

                                if(radiusError<0)

                                                radiusError+=2*y+1;

                                else

                                {

                                                x--;

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

                                }

                }

}

 /****************************************************************************/