Question

C++, Visual Studio

3. Define a class called Odometer that will be used to track fuel and mileage for an automobile. The class should have instance variables to track the miles driven and the fuel efficiency of the vehicle in miles per gallon. Include a mutator method to reset the odometer to zero miles, a mutator method to set the fuel efficiency, a mutator method that accepts miles driven for a trip and adds it to the odometer's total, and an accessor method hat returns the number of gallons of gasoline that the vehicle has consumed since the odometer was last reset. Use your class with a test program that creates several trips with different fuel efficiencies. You should decide which variables should be public, if any.

Answer 1

Program:

#include <iostream>

using namespace std;

// Creating Odometer class
class Odometer
{
private:
// Declaring variables
int milesDriven;
double fuelEfficiency;
int noOfGallonsUsed;

public:
int totalMilesDriven;

Odometer();
// Function declarations
void reset();
void setFuelEfficiency(double FuelEff);
void addMiles(int milesDrivenInTrip);
double getGasolineConsumed();
};
// Default constructor
Odometer::Odometer()
{
totalMilesDriven = 0;
fuelEfficiency = 0.0;
}

// Function implementations
void Odometer::reset()
{
this->milesDriven = 0;
}
void Odometer::setFuelEfficiency(double FuelEff)
{
this->fuelEfficiency = FuelEff;
}
void Odometer::addMiles(int milesDrivenInTrip)
{
milesDriven = milesDrivenInTrip;
totalMilesDriven += milesDrivenInTrip;
}
double Odometer::getGasolineConsumed()
{
return milesDriven / fuelEfficiency;
}

int main()
{
// Declaring variables
int noOfMilesDriven;
double fuelEfficiency;

// Create a instance of Odometer class
Odometer trip1;

// getting the data entered by the user
cout << "Enter the no of Miles Driven in trip#1:";
cin >> noOfMilesDriven;

// Calling the setter method
trip1.addMiles(noOfMilesDriven);

// getting the fuel efficiency entered by the user
cout << "Enter Fuel Efficiency :";
cin >> fuelEfficiency;

// Calling the setter method
trip1.setFuelEfficiency(fuelEfficiency);

// Displaying the no of gallons used in that trip#1
cout << "No of Gallons of Gasoline used for " << noOfMilesDriven
<< " in trip#1 :" << trip1.getGasolineConsumed() << endl;

trip1.reset();

Odometer trip2;
cout << "Enter the no of Miles Driven in trip#2:";
cin >> noOfMilesDriven;

trip2.addMiles(noOfMilesDriven);

cout << "Enter Fuel Efficiency :";
cin >> fuelEfficiency;
trip2.setFuelEfficiency(fuelEfficiency);

// Displaying the no of gallons used in that trip#2
cout << "No of Gallons of Gasoline used for " << noOfMilesDriven
<< " in trip#1 :" << trip2.getGasolineConsumed() << endl;

// Displaying the total no of gallons used
cout << "Total No of Miles driven :" << trip2.totalMilesDriven << endl;
}

Output: