Simple class in Matlab
======================


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Put the following in a file called Square.m
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
classdef Square
  properties (SetAccess=private, GetAccess=private)
    x1 = [0,0];  % x1 is the bottom left corner, initialised to (0,0) 
    x2 = [1,1];  % x2 is the top right corner, initialised to (1,1)
  end
  
  methods
    function obj = Square()  % constructor, does nothing
    end

    function Plot(obj)
      plot([obj.x1(1) obj.x2(1) obj.x2(1) obj.x1(1) obj.x1(1)],[obj.x1(2) obj.x1(2) obj.x2(2) obj.x2(2) obj.x1(2)]);
    end

    function area = GetArea(obj)
      area = (obj.x2(2)-obj.x1(2))*(obj.x2(1)-obj.x1(1));
    end
  end
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  end of Square.m
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%% Usage:

a = Square();
a.GetArea()
a.Plot();






Equivalent class (excl. Plot function) in C++
=============================================

// class definition

class Square
{
private:
    double x1[2];    
    double x2[2];

public:    
    Square() // Constructor, initialises member variables
    {        
        x1[0] = 0.0;
        x1[1] = 0.0;       
        x2[0] = 1.0;       
        x2[1] = 1.0;
    }    

    double GetArea() 
    {
        return (x2[0]-x1[0])*(x2[1]-x1[1]);    
    }
};



// Usage

Square my_square;
double area = my_square.GetArea();