C++ Exception Handling Program Sample Driver: TrashCan yours; TrashCan mine; Tra

Question

C++ Exception Handling Program

Sample Driver:

TrashCan yours;
TrashCan mine;
TrashCan test;

yours.setSize( 10 );
mine.setSize( 10 );
test.setSize( 5 );

yours.addItem( );
mine.addItem( );
mine.addItem( );
mine.addItem( );
mine.addItem( );
mine.addItem( );
test.addItem( );
test.addItem( );
test.addItem( );
test.addItem( );
test.addItem( );

cout << test << endl;

try {
// contents will become negative...
// an exception should get thrown
test = yours - mine;
} catch( std::logic_error le ) {
cout << "subtraction failed" << endl;
}

/// test should be unchanged
cout << test << endl;

try {
// how can you have a negative size
// an exception should get thrown
test = TrashCan( -100 );
} catch( std::logic_error le ) {
cout << "constructor failed" << endl;
}

/// test should be unchanged
cout << test << endl;

try {
// how can you have 5 pieces of
// trash in a can that
// can only hold 3??
// an exception should get thrown
test.setSize( 3 );
} catch( std::logic_error le ) {
cout << "setSize failed" << endl;
}

/// test should be unchanged
cout << test << endl;

try {
// how can you have a negative
// contents value??
test = TrashCan( 10, -100 );
} catch( std::logic_error le ) {
cout << "constructor failed" << endl;
}

The purpose of this assignment is to work with exceptions. As you may recall, l have provided you with a sample class named TrashCan which has been diagrammed below. I'd like you to enhance this class so that invoking its methods or operators potentially throw exceptions, rather than just printing error messages to cout. Currently our favorite exception class is std: logic error. You can create a logic error by passing a string value to its constructor. Officially, you should also say #include

Explanation / Answer

#include <iostream>
#include "TrashCan.h"

using namespace std;

int main( ) {

// Let's use the TrashCan
cout << "Welcome to Howie's Trash-R-Us." << endl;
cout << "Reuse, Reduce, Recycle!" << endl;

TrashCan t;
t.setSize( 10 );
t.addItem();
t.cover();
t.printCan();

return( 0 );

}

TrashCan yours( 5, 3 );

TrashCan mine( 100, 3 );
yours.addItem( );
mine.addItem( );

cout << "----some tests follow----" << endl;

TrashCan eightItems = mine + mine;
TrashCan zeroItems = yours - yours;
eightItems.printCan();
zeroItems.printCan();
if (eightItems > zeroItems) {
cout << "> is working..." << endl;
}
if (eightItems != zeroItems) {
cout << "!= is working..." << endl;
}
if (zeroItems < eightItems) {
cout << "< is working..." << endl;
}
if (eightItems == eightItems) {
cout << "== is working..." << endl;
}

cout << "---some broken code follows---";
// each of the operator calls below should print out
// some kind of error message, instead of working correctly...

TrashCan negativeItems = mine - eightItems;

TrashCan overfull = yours + yours;

Follwoing is requried code

TrashCan (int size)

{

if(size < 0)

{

throw logic_error( "Constructor (size) :Size value is negative");

}

else

{

if (myContents > size)

{

throw logic_error( "Constructor (size) :myContents value exceeds size value");

}

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