Write a program that defines a class named Rectangle. The Rectangle class should

Question

Write a program that defines a class named Rectangle. The Rectangle class should contain the following: variables to hold the length and width of the rectangle instance constructors to allow a Rectangle to be declared in two ways: o without parameters - length & width will be set to zero o with 2 integer parameters - length and width accessor and mutator functions for length and width There should be a driver program that tests all functions of the class, including the two constructors. Your program should be contained in an Empty Project named RectangleClass. You will create 3 separate files: rectangle.h (class definition), rectangle.cpp (class functions implementations) and rectangle_driver.cpp (program with the main() function to test all functions of the class.

I'm having trouble writing my C++ program and understanding it.

Explanation / Answer

main.cpp

// This program demonstrates Rectangle class exceptions.
#include <iostream>
#include "Rectangle.h"
using namespace std;

int main()
{
   int width;
   int length;

   // Create a Rectangle object.
   Rectangle myRectangle;

   // Get the width and length.
   cout << "Enter the rectangle's width: ";
   cin >> width;
   cout << "Enter the rectangle's length: ";
   cin >> length;

   // Store these values in the Rectangle object.
   try
   {
      myRectangle.setWidth(width);
      myRectangle.setLength(length);
      cout << "The area of the rectangle is "
           << myRectangle.getArea() << endl;
   }
   catch (Rectangle::NegativeSize)
   {
      cout << "Error: A negative value was entered. ";
   }
   cout << "End of the program. ";

   return 0;
}

Rectangle.h
// Specification file for the Rectangle class
#ifndef RECTANGLE_H
#define RECTANGLE_H

class Rectangle
{
   private:
      double width;     // The rectangle's width
      double length;    // The rectangle's length
   public:
      // Exception class
      class NegativeSize
         { };            // Empty class declaration

      // Default constructor
      Rectangle()
         { width = 0.0; length = 0.0; }
    
      // Mutator functions, defined in Rectangle.cpp
      void setWidth(double);
      void setLength(double);
    
      // Accessor functions
      double getWidth() const
         { return width; }

      double getLength() const
         { return length; }

      double getArea() const
         { return width * length; }
};
#endif

Rectangle.cpp

// Implementation file for the Rectangle class.
#include "Rectangle.h"

//***********************************************************
// setWidth sets the value of the member variable width.    *
//***********************************************************

void Rectangle::setWidth(double w)
{
   if (w >= 0)
      width = w;
   else
      throw NegativeSize();
}

//***********************************************************
// setLength sets the value of the member variable length. *
//***********************************************************

void Rectangle::setLength(double len)
{
   if (len >= 0)
      length = len;
   else
      throw NegativeSize();
}

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