Midpoint circle

#include <stdio.h>
#include <conio.h>
#include <graphics.h>

void drawPoints(int, int, int, int);

void drawCircle(int xc, int yc, int r){
    int x0,y0,p;
    x0=0;
    y0=r;
    p=1-r;
    while(x0<y0){
        if(p<0){
            x0=x0+1;
            p=p+(2*x0)+1;
        }
        else{
            x0=x0+1;
            y0=y0-1;
            p=p+(2*x0+1-(2*y0));
        }
        drawPoints(x0,y0,xc,yc);
    }
}
void drawPoints(int x, int y, int xc, int yc){
    putpixel(xc+x,yc+y,5);
    putpixel(xc-x,yc+y,5);      `

    putpixel(xc+x,yc-y,5);
    putpixel(xc-x,yc-y,5);
    putpixel(xc+y,yc+x,5);
    putpixel(xc-y,yc+x,5);
    putpixel(xc+y,yc-x,5);
    putpixel(xc-y,yc-x,5);
}

int main()
{
    int xc, yc, r;
    int gdriver=DETECT, gmode;
    initgraph(&gdriver,&gmode,"C:\\TURBOC3\\BGI");

    printf("Enter the centre of the circle:\n");
    scanf("%d%d",&xc,&yc);
    printf("Enter the radius of the circle:\n");
    scanf("%d",&r);

    clrscr();
    drawCircle(xc,yc,r);
    getch();
    return 0;
}