grid3d.h

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#include <iostream>

using namespace std;

// grid3d: a class to represent a grid point (x, y, z) in 3-dimensional
//         space, where x is the x co-ordinate, y is the y co-ordinate, and
//         z is the z co-ordinate.
//         x is represented by data[0]
//         y is represented by data[1]
//         z is represented by data[2]

class grid3d {

public:
   // default constructor. It creates a point (0,0,0)
   grid3d();

   // copy constructor
   grid3d(const grid3d&);

   // conversion constructor that can convert an integer to a grid3d object
   grid3d(int);

   // another constructor
   grid3d(int, int, int);
 
   // destructor;
   ~grid3d();

   // assignment operator
   grid3d & operator=(const grid3d & );

   // function for output. 
   void print() const;

   // Three functions to return the co-ordinates of the grid point
   // getx() returns the integer x co-ordinate
   // gety() returns the integer y co-ordinate
   // getz() returns the integer z co-ordinate
   int getx() const;
   int gety() const;
   int getz() const;

   // Overload the operator ">>" such that if PT is of type grid3d,
   // cin >> PT   asks the user for three integers: x co-ordinate,
   // y co-ordinate and z co-ordinate.
   friend istream& operator>>(istream&, grid3d&);

private:
   int *data;
} ;

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