Project 1: Fuller TrashCan Using TrashCan.cpp (.NET 2012 XCode ), enhance the Tr

Question

Project 1: Fuller TrashCan

Using TrashCan.cpp (.NET 2012 XCode ), enhance the TrashCan class so that it supports the operators +, -, < and >. A sample pile of driver code is shown below to assist you in this effort. Operators + and - should create a new TrashCan from the two arguments by combining their contents. If you wind up with a TrashCan with a size that exceeds its capacity, print out an error message. If you wind up with a negative capacity or negative size, print out an error message.   Operators < and > must return bool and should compare the holdings of the two arguments to determine which one is bigger.

My strong advice is to work one operator at a time, as these steps are very error-prone and lead to many, many compile errors.

TrashCan Class

void setSize( int size );
int getSize( );
int getContents( );
void addItem( );
void empty( );
void cover( );
void uncover( );

void printCan( );

Driver Code

#include "TrashCan.h"

#include <iostream>
using namespace std;

int main( ) {

  cout << "Welcome to Howie's TrashCan Program!" << endl;

  TrashCan myCan;
  TrashCan yourCan;

  yourCan.setSize( 12 );
  myCan.setSize( 12 );

  yourCan.addItem( );
  yourCan.addItem( );
  myCan.addItem( );

  myCan.printCan();
  yourCan.printCan();

  TrashCan combined = yourCan + myCan;
  cout << "this can's filled to " << combined.getContents( ) << endl;

  TrashCan other = combined – myCan;
  cout << "the other can's filled to " << other.getContents( ) << endl;

  if (combined > other) {
    cout << "looks like combined is bigger..." << endl;
  }
  else {
    cout << "looks like other is bigger..." << endl;
  }

  if (myCan > other) {
    cout << "looks like myCan is bigger..." << endl;
  }
  else {
    cout << "looks like other is bigger..." << endl;
  }

  if (yourCan < myCan) {
    cout << "looks like yourCan is smaller..." << endl;
  }
  else {
    cout << "looks like myCan is smaller..." << endl;
  }

  return( 0 );

}

TrashCan Class

TrashCan( );
TrashCan(int size );
TrashCan(int size, int contents );

void setSize( int size );
int getSize( );
int getContents( );
void addItem( );
void empty( );
void cover( );
void uncover( );

void printCan( );

bool myIsCovered;
int my_Size;
int my_Contents;

Explanation / Answer

Below are the two working overloading operator for your trash class. We need to overload + and - operator to make it work as specified in the problem. Based on the UML the implentation of the operators will look like as shown below:

for + operator code will be

TrashCan operator+(const TrashCan& b)
      {
         TrashCan comb;
         comb.size = this->size+ b.size;

         if (comb.size > 20) ///assuming max capacity is 20 here

        cout<<"you have crossed the maximum size of the can"<<endl;
         return comb;
      }

for - operator code will be

TrashCan operator-(const TrashCan& b1)
      {
         TrashCan comb;
         comb.size = this->size- b1.size;

         if(comb.size < 0)

         cout<<"output of this operation is negative"<<endl;
         return comb;
      }

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