// Example 63

#include <iostream>
#include <cstdlib>
#include <cmath>
using namespace std;

// Class declaration...
class sphere {
public:
       double x_center, y_center, z_center, radius;
       double volume( void );
};

double sphere::volume( void )  // :: is the scope resolution operator.
                               // It signifies that volume is a member of sphere class
{
       double V = 4.0 * M_PI * pow( radius, 3 ) / 3.0;
       return( V );
}
       
int main()
{
    sphere ball;                   
    sphere BALL[10];
    
    ball.x_center = 1.0;
    ball.y_center = 2.0;
    ball.z_center = -1.0;
    ball.radius = 5.0;
    
    BALL[0] = ball;
    
    cout << "The volume of BALL[0] is " << BALL[0].volume() << endl;
        
    cout << "\n\n"; system( "PAUSE" );
    return( EXIT_SUCCESS );
}