circle using mid point algorithm

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
void circle1(int,int,int,int);
void circlealgo(int,int,int);

int main()
{
  int radius,x,y;
  int gd=DETECT,gm;
  initgraph(&gd,&gm," ");
  printf("\n Enter x:");
  scanf("%d",&x);
   printf("\n Enter y:");
  scanf("%d",&y);
   printf("\n Enter radius:");
  scanf("%d",&radius);
  circlealgo(x,y,radius);
  getch();
  closegraph();
  return 0;

}
void circle1(int x0, int y0,int x1,int y1)
{
   putpixel(x0+x1,y0+y1,123);
   putpixel(x0-x1,y0+y1,90);
   putpixel(x0+x1,y0-y1,75);
   putpixel(x0-x1,y0-y1,200);
   putpixel(x0+y1,y0+x1,500);
   putpixel(x0-y1,y0+x1,45);
   putpixel(x0+y1,y0-x1,178);
   putpixel(x0-y1,y0-x1,12);

}
void circlealgo(int xcenter,int ycenter,int r)
{
  int x=0;
  int y=r;
  int p=1-r;
  circle1(xcenter,ycenter,  x, y);
    while(x<y)
  {
    x++;
    if(p<0)
    {
     p=p+(2*x)+1;
     }
    else
    {
      y--;
      p=p+(2*x)+1-(2*y);

    }
    circle1( xcenter, ycenter, x, y);
  }
  }