Thread: draw function HELP!!!

I am writing this program to draw a sphere, I am having problems with the draw function which is giving me an error(bold). Can anyone help me to write the draw function for this program.

also, I want to have the user input the values for x,y, z, and radius. I now that I have to put a cout asking for the values and cin to get the values in main or maybe I can use get. Can anyone give me an idea how to work this out.

here is the code

Code:

#include <iostream>
#include <math.h>
#include <iomanip>
#include <stdio.h>

#define PI 3.1415927

using namespace std;

class point
{
public:
    point(const float xx, const float yy, const float zz) { x=xx; y=yy; z=zz; }
    point(const point &p) { x = p.getX(); y = p.getY(); z = p.getZ(); }
    point() { x = y = z = 0.0; }
    float getX() const { return x; }
    float getY() const { return y; }
    float getZ() const { return z; }
private:
    float x,y,z;
};


class shape3d 
{
public:
    shape3d(const point &pp) { p = pp; }
    shape3d(const float x, const float y, const float z) { p = point(x,y,z); }
    point getPoint() const { return p; }
    virtual float getVolume() const = 0; 
   //virtual void draw( shape3d *todraw) const { todraw->draw(); }
private:
    point p;
};


class sphere: public shape3d
{
public:
    sphere(const point &p, const float r):shape3d(p) { radius = r; }
    float getRadius() const { return radius; }
    float getVolume() const { return 3.0*(PI*radius*radius*radius)/4.0; }
	//error: draw function doesn't take 0 parameters
    virtual void draw( sphere *todraw) const { todraw->draw(); }

private:
    float radius;
};


main()
{
        point p = point (0,0,0);
       sphere s = sphere (p,50); 
      //error: draw function doesn't take 0 parameters
     s.draw();
return 0;
  }