Using FlashDrive.cpp ( VS2010 or VS2012 or XCode5 or XCode6 or XCode7 ), enhance

ID: 3661949 • Letter: U

Question

Using FlashDrive.cpp ( VS2010 or VS2012 or XCode5 or XCode6 or XCode7 ), enhance the FlashDrive 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 FlashDrive from the two arguments by combining their contents. If you wind up with a FlashDrive with a value stored that exceeds its capacity, print out an error message. If you wind up with a negative capacity or storage value, 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. Operator << should print out the values of the private member variables. Operator >> should read in and set the values of the private member variables.

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.

FlashDrive( );
FlashDrive( int capacity, int used, bool pluggedIn );

void plugIn( );
void pullOut( );
void writeData( int amount );
void eraseData( int amount );
void formatDrive( );

int getCapacity( );
void setCapacity( int amount );

int getUsed( );
void setUsed( int amount );

bool isPluggedIn( );

#include <iostream>
#include "FlashDrive.h"
using namespace std;

void main( )
{
FlashDrive drive1( 10, 0, false );
FlashDrive drive2( 20, 0, false );

drive1.plugIn( );
drive1.formatDrive( );
drive1.writeData( 5 );
drive1.pullOut( );

drive2.plugIn( );
drive2.formatDrive( );
drive2.writeData( 1 );
drive2.pullOut( );

FlashDrive combined = drive1 + drive2;
cout << "this drive's filled to " << combined.getUsed( ) << endl;

FlashDrive other = combined – drive1;
cout << "the other drives's filled to " << other.getUsed( ) << endl;

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

if (drive2 > other) {
cout << "looks like drive2 is bigger..." << endl;
}
else {
cout << "looks like other is bigger..." << endl;
}

if (drive2 < drive1) {
cout << "looks like drive2 is smaller..." << endl;
}
else {
cout << "looks like drive1 is smaller..." << endl;
}

cout << "Here is drive1...." << endl;
cout << drive1 << endl;
cin >> "Let's set drive1...." << endl;
cin >> drive1;
cout << "Here is drive1. Notice the changes..." << endl;
cout << drive1 << endl;

}

FlashDrive Sample Driver Code FlashDrive

FlashDrive( );
FlashDrive( int capacity, int used, bool pluggedIn );

void plugIn( );
void pullOut( );
void writeData( int amount );
void eraseData( int amount );
void formatDrive( );

int getCapacity( );
void setCapacity( int amount );

int getUsed( );
void setUsed( int amount );

bool isPluggedIn( );

int my_StorageCapacity;
int my_StorageUsed;
bool my_IsPluggedIn;

#include <iostream>
#include "FlashDrive.h"
using namespace std;

if (drive2 < drive1) {
cout << "looks like drive2 is smaller..." << endl;
}
else {
cout << "looks like drive1 is smaller..." << endl;
}

cout << "Here is drive1...." << endl;
cout << drive1 << endl;
cin >> "Let's set drive1...." << endl;
cin >> drive1;
cout << "Here is drive1. Notice the changes..." << endl;
cout << drive1 << endl;

}

Explanation / Answer

// ******************** *******************//
//Creating FlashDrive Class
//*************************************//

class FlashDrive
{
   // integer varaibles
   int capacity,used,amount,my_StorageCapacity,my_StorageUsed;

   // boolean varaibles return true or false
   bool my_IsPluggedIn;
public:
   FlashDrive();// constructor

FlashDrive(capacity,used,my_IsPluggedIn);//parameter constructor

   // methods
   void plugIn( );
   void pullOut( );
   void writeData( int amount );
   void eraseData( int amount );
   void formatDrive( );
   int getCapacity( );
   void setCapacity( int amount );
   int getUsed( );
   void setUsed( int amount );
   bool isPluggedIn( );

   // adding of two objects values of FlashDrive class

FlashDrive add(FlashDrive drive1,FlashDrive drive2);

//Subtracting of two objects values from FlashDrive class

FlashDrive sub(FlashDrive drive1,FlashDrive drive2);

};

//Default Constructor

FlashDrive::FlashDrive(void){
cout<<"Flash Drive Object Created";
}

//parameter constructor

FlashDrive::FlashDrive(int capacity,int used, bool my_IsPluggedIn)
{
   capacity = capacity;
   used = used;
   my_IsPluggedIn = my_IsPluggedIn;
}

void FlashDrive::WriteData(int number){

number =number;
}

void FlashDrive::setCapacity(int amount){

amount = amount;
}

int FlashDrive::getCapacity(){

return capacity;
}

void FlashDrive::setUsed(int used){

used = used;
}

int FlashDrive::getUsed(){
return used;
}

bool FlashDrive::isPluggedIn(bool my_IsPluggedIn;){

my_IsPluggedIn = my_IsPluggedIn;
}

// addition of two FlashDrive objects

FlashDrive::add(FlashDrive drive1,FlashDrive drive2){

//Creating drive3 object for addition of 2 drive objects

FlashDrive drive3 ;

drive3.getCapacity = drive1.getCapacity() + drive2.getCapacity();

drive3.getUsed = drive1.getUsed() + drive2.getUsed();

cout<<"FlashDrive 3 Objects<<" "<<drive3.getCapacity <<" "<<drive3.getUsed;

}

FlashDrive::sub(FlashDrive drive1,FlashDrive drive2){

//Creating drive3 object for subtraction of 2 drive objects

FlashDrive drive3 ;

drive3.getCapacity = drive1.getCapacity() -drive2.getCapacity();

drive3.getUsed = drive1.getUsed() - drive2.getUsed();

cout<<"FlashDrive 3 Objects<<" "<<drive3.getCapacity <<" "<<drive3.getUsed;

}

#include <iostream>
using namespace std;

void main( )
{
FlashDrive drive1( 10, 0, false );
FlashDrive drive2( 20, 0, false );

drive1.plugIn( );
drive1.writeData( 5 );

drive2.plugIn( );
drive2.writeData( 1 );

FlashDrive combined = add(drive1,drive2);

cout << "this drive's filled to " << combined.getUsed( ) << endl;

FlashDrive other = sub(drive1,drive);

cout << "the other drives's filled to " << other.getUsed( ) << endl;

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

if (drive2 > other) {
cout << "looks like drive2 is bigger..." << endl;
}
else {
cout << "looks like other is bigger..." << endl;
}
if (drive2 < drive1) {
cout << "looks like drive2 is smaller..." << endl;
}
else {
cout << "looks like drive1 is smaller..." << endl;
}
cout << "Here is drive1...." << endl;
cout << drive1 << endl;
cin >> "Let's set drive1...." << endl;
cin >> drive1;
cout << "Here is drive1. Notice the changes..." << endl;
cout << drive1 << endl;
}

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