CIRCLE PROGRAM USING TRIGONOMETRIC METHOD (GRAPHICS)

#include<graphics.h>

#include<stdio.h>

#include<conio.h>

#include<math.h>

void plotcircle(int,int,int,int);

void main()

{

   int gd = DETECT, gm;

   int xc,yc,x,y,c,s,r,d,temp;

   initgraph(&gd, &gm, "");

  

   printf("\n Enter the values xc: \nyc:\nr:\n");

   scanf("%d%d%d",&xc,&yc,&r);

   x=0;

   y=r;

   d=1/r;

   c=cos(d);

   s=sin(d);

   plotcircle(xc,yc,x,y);

   while(x<=y)

     {

                plotcircle(xc,yc,x,y);

               temp=x;

               x=((x*c)-(y*s));

               y=((y*c)+(temp*s));

      }

  getch();

  }

void plotcircle(int xc,int yc,int x,int y)

                {

                putpixel(xc+x,yc+y,2);

                putpixel(xc-x,yc+y,2);

                putpixel(xc+x,yc-y,2);

                putpixel(xc+y,yc+x,2);

                putpixel(xc-y,yc-x,2);

                putpixel(xc-y,yc+x,2);

                putpixel(xc+y,yc-x,2);

                putpixel(xc-x,yc-y,2);

                }