Bresenham's circle drawing

Q)Circle generation using bresenham’s circle drawing algorithm.
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include<iostream.h>
void drawcir(float x,float y,float p,float q){
putpixel(x+p,y+q,3);
putpixel(x-p,y+q,3);
putpixel(x+p,y-q,3);
putpixel(x-p,y-q,3);
putpixel(x+q,y+p,3);
putpixel(x-q,y+p,3);
putpixel(x+q,y-p,3);
putpixel(x-q,y-p,3);
    }
int main()
{
   int gdriver = DETECT, gmode;
   initgraph(&gdriver, &gmode, "C:\\TC\\bgi");
   float gx,gy,grad;
   cout<<"enter the x coordinateof the centre";
   cin>>gx;
   cout<<"enter the y coor of the centre";
   cin>>gy;
  cout<<"enter the radious of the circle";
  cin>>grad;
  float p=0;
  float q=grad;
  float d=3-2*grad;
  while(p<q){
  drawcir(gx,gy,p,q);
p++;
if(d<0)
{d=d+4*p+6;
}
  else{
q--;
  d=d+4*(p-q)+10;
  }
drawcir(gx,gy,p,q);
  }
   getch();
   closegraph();
   return 0;
}