//----------------------------------------------------------------
//
// point-with-constructor.cpp
//
// Implements a point in two dimensional space. Based on the example
// from Pohl, C++ by Dissection, pages 166-169, but with added 
// constructors.
//
// written by: Simon Parsons
// modified  : 13th March 2009
//
//----------------------------------------------------------------

#include <iostream>
using namespace std;

//----------------------------------------------------------------
//
// point

// The class point represents a location in a set of cartesian coordinates.
//
// It has two data members, an x and a y value, and three constructors.
// The constructors initialise the data members.
 
class point {

private:
  double x, y;

public:

  point() : x(0), y(0) { }	     // Default constructor
  point(double);                     // Convert double to point
  point(double, double);             // Initialise both x and y if we are
                                     // given values for them.

  void print() const;
  void set( double u, double v );
  double getX();
  double getY();

}; 

// Constructors

inline point::point(double u){       // Illustrates the use of "inline"
  x = u;
}

point::point(double x, double y){    // Shows one use of "this"
  this->x = x;
  this->y = y;
}

// Print the values 

void point::print() const {
  cout << "(" << x << "," << y << ")\n";
}
 
// Set the values.

void point::set( double u, double v ) {
  x = u;
  y = v;
}

// Accessor functions. We need these to get hold of x and y since they
// are private.

double point::getX(){
  return x;
}

double point::getY(){
  return y;
}

// End of point


//----------------------------------------------------------------
//
// Main program

// This creates three instances of point, creating them in different ways, and
// then printing out their contents.

int main() {
  point a;
  point b(2.2);
  point c(2.3, 4.5);

  a.set(1.2, 3.4);
  cout << "point a = ";
  a.print();
  cout << "point b = ";
  b.print();
  cout << "point c = ";
  c.print();

} 

// end of main()