Question

CIS247C Week 3 Project Overview

The objective of this week is to enhance last week's Vehicle class by making the following changes:
• Create a static variable called numVehicles that holds an int and initialize it to zero. This will allow us to count all the Vehicle objects created in the main class.
• Add the copy constructor
• Increment numVehicles in all of the constructors
• Decrement numVehicle in destructor
• Add overloaded versions of setYear and setMpg that accept strings. This way, we will have two "set" methods; one that accepts a string, and one that accepts its default data type.

In the Vehicle class complete the following steps:
1. Create a static numVehicles variable and initialize it to zero.
2. Create a copy constructor.
3. Update the destructor to decrement numVehicles by one.
4. Increment numVehicles by one in each of the constructors.
5. Create an overloaded setYear method and this time make the parameter a string.
6. Create an overloaded setMpg method and this time make the parameter a string.
**Remember that you will have to convert the string in the above two "set" methods to the data type of the attribute.**
7. Make the getNumVehicles a static method. This way, you can call it with the class name instead of an object name.

In the main program create code statements that perform the following operations Note that several of the steps below were accomplished in last week's assignment. New steps are in bold.
1. Using your code from Week 1, display a divider that contains the string "Start Program".
2. Update and call the DisplayApplicationInformation function.
3. Create a Vehicle object using the default constructor.
4. Prompt for and then set year and mpg using the new overloaded setters. Consider using your getInput method from Week 1 to obtain data from the user for this step as well as Step 3.
5. Using your code from Week 1, display a divider that contains the string "Vehicle 1 Information".
6. Display the Vehicle Information.
7. Create a second Vehicle object using the multi-arg constructor, setting each of the attributes with the following values: "Cadillac", 2017, 26.5
8. Create a third object by copying the second object.
9. Delete the third object by calling the destructor method.
10. Display the number of vehicles created using getNumVehicles. Remember to access getNumVehicles using the class name, not the Vehicle object.
11. Update and call the TerminateApplication function.

Source.cpp

//Programmer: Dr. Natalie Waksmanski

//CIS247C Week 2 Project

//Program Description:

#include "Vehicle.h"

#include

#include

using namespace std;

void DisplayApplicationInformation();

void DisplayDivider(string);

string GetInput(string);

void TerminateApplication();

int main()

{

       Vehicle car1;

       Vehicle car2("Cadillac", 2020, 19);

       DisplayApplicationInformation();

       DisplayDivider("Get Car Make ");

       car1.setMake(GetInput("Make "));

       DisplayDivider("Get Year");

       car1.setYear(atoi(GetInput("Year ").c_str()));

       DisplayDivider("Get Mileage");

       car1.setMileage(atof(GetInput("Mileage ").c_str()));

       DisplayDivider("Vehicle Information");

       car1.displayVehicle();

       DisplayDivider("Vehicle Information");

       car2.displayVehicle();

       TerminateApplication();

       system("pause");

       return 0;

      

}

void DisplayApplicationInformation()

{

       cout << "Welcome to CIS247C Project";

       cout << "This program uses the Vehicle class to prompt the user for vehicle information, gather information about the attributes, and display the results";

       return;

}

void DisplayDivider(string message)

{

       cout << "\n***************" << message << "********" << endl;

}

string GetInput(string message)

{

       string input;

       cout << "Enter the " << message;

       getline(cin, input);

       return input;

}

void TerminateApplication()

{

       cout << "End of CIS247C Project Application";

       return;

}

Vehicle.h

#pragma once

#include

using namespace std;

class Vehicle

{

private:

       string make;

       int year;

       double mpg;

public:

       Vehicle();

       ~Vehicle();

       Vehicle(string, int, double);

       void setYear(int);

       int getYear();

       void setMake(string);

       string getMake();

       void setMileage(double);

       double getMileage();

       void displayVehicle();

};

Vehicle.cpp

#include "Vehicle.h"

#include

#include

using namespace std;

Vehicle::Vehicle()

{

       make = "unknown";

       year = 0;

       mpg = 0;

}

Vehicle::Vehicle(string m, int y, double mg)

{

       make = m;

       year = y;

       mpg = mg;

}

Vehicle::~Vehicle()

{

}

int Vehicle::getYear()

{

       return year;

}

void Vehicle::setYear(int y)

{

       year = y;

}

void Vehicle::setMake(string m)

{

       make = m;

}

string Vehicle::getMake()

{

       return make;

}

void Vehicle::setMileage(double mg)

{

       mpg = mg;

}

double Vehicle::getMileage()

{

       return mpg;

}

void Vehicle::displayVehicle()

{

       cout << "Vehicle make: " << make << endl;

       cout << "Vehicle year: " << year << endl;

       cout << "Vehicle mpg: " << mpg << endl;

}

THIS IS ALL THE INFORMATION I HAVE, i DONT KNWO WHAT ELSE YOU WANT. THE PRIOR WEEK CODE IS INCLUDED AND THE ASSIGNGMENT IS IN BOLD ITALIC. THIS IS ALL I HAVE TO GO WITH

Answer 1

Vehicle.h

#pragma once

#include<bits/stdc++.h>

using namespace std;

class Vehicle

{

private:

       string make;

       int year;

       double mpg;

                

                 static int numVehicles;

public:

       Vehicle();

       ~Vehicle();

       Vehicle(string, int, double);

                

                 // Copy constructor

                 Vehicle(const Vehicle &v);

       void setYear(int);

                

                 void setYear(string);

       int getYear();

       void setMake(string);

       string getMake();

       void setMileage(double);

                

                 void setMileage(string);

       double getMileage();

       void displayVehicle();

                

                 static int getNumVehicles()

                 {

                                return numVehicles;

                 }

};

Vehicle.cpp

#include "Vehicle.h"

using namespace std;

Vehicle::Vehicle()

{

                 numVehicles++;

       make = "unknown";

       year = 0;

       mpg = 0;

}

Vehicle::Vehicle(string m, int y, double mg)

{

                 numVehicles++;

                

       make = m;

       year = y;

       mpg = mg;

}

int Vehicle::numVehicles = 0;

Vehicle::Vehicle(const Vehicle &v)

{

              numVehicles++;

             

              make = v.make;

    year = v.year;

    mpg = v.mpg;

             

}

Vehicle::~Vehicle()

{

              numVehicles--;

}

int Vehicle::getYear()

{

       return year;

}

void Vehicle::setYear(int y)

{

       year = y;

}

void Vehicle::setYear(string y)

{

       year = atoi(y.c_str());

}

void Vehicle::setMake(string m)

{

       make = m;

}

string Vehicle::getMake()

{

       return make;

}

void Vehicle::setMileage(double mg)

{

       mpg = mg;

}

void Vehicle::setMileage(string mg)

{

       mpg = atof(mg.c_str());

}

double Vehicle::getMileage()

{

       return mpg;

}

void Vehicle::displayVehicle()

{

       cout << "Vehicle make: " << make << endl;

       cout << "Vehicle year: " << year << endl;

       cout << "Vehicle mpg: " << mpg << endl;

}

Source.cpp

//Programmer: Dr. Natalie Waksmanski

//CIS247C Week 2 Project

//Program Description:

#include "Vehicle.h"

using namespace std;

void DisplayApplicationInformation();

void DisplayDivider(string);

string GetInput(string);

void TerminateApplication();

int main()

{

                 DisplayDivider("Start Program");

                

                 DisplayApplicationInformation();

                

                

                 Vehicle car1;

                

                 DisplayDivider("Get Year");

       car1.setYear(GetInput("Year "));

       DisplayDivider("Get Mileage");

       car1.setMileage(GetInput("Mileage "));

                

                

                 DisplayDivider("Vehicle Information");

       car1.displayVehicle();

                

       Vehicle car2("Cadillac", 2017, 26.5);

                

                 Vehicle car3(car2);

                

                 car3.~Vehicle();

                

                

                 DisplayDivider("Number of Vehicles: ");

                 cout<<Vehicle::getNumVehicles()<<endl;

                

       TerminateApplication();

       system("pause");

       return 0;

     

}

void DisplayApplicationInformation()

{

       cout << "Welcome to CIS247C Project";

       cout << "This program uses the Vehicle class to prompt the user for vehicle information, gather information about the attributes, and display the results";

       return;

}

void DisplayDivider(string message)

{

       cout << "\n***************" << message << "********" << endl;

}

string GetInput(string message)

{

       string input;

       cout << "Enter the " << message;

       getline(cin, input);

       return input;

}

void TerminateApplication()

{

       cout << "End of CIS247C Project Application";

       return;

}

Comments:

This runtime error is observed at the end:

*** Error in `./a.out': double free or corruption (fasttop): 0x000000000102cc50 ***

This is because this object is created using copy constructor and we are doing deep copy. This is error expected. Since we are freeing two times, one time calling the destructor and another time during exit of the program.

There are various ways to prevent this:

1. Move constructor
2. Shallow copy

Since this behavior is not mentioned in the steps asked, I have not done it. It is not necessary as per the given question.

Thanks.

Please comment if you need further help.

Screenshot of the output:

**Start Program Welcome to CIS247C ProjectThis program uses the Vehicle class to prompt the user for vehicle information, gather information about the attributes, and display the results Enter the Year 2019 Enter the Mileage 45 cle Vehicle make: unknown Vehicle year: 2019 Vehicle mpg: 45 Error in ./a.out': double free or corruption (fasttop): 0x000000000102cc50 End of CIS247C Project ApplicationAborted