15. Car Instrument Simulator For this assignment you will design a set of classe

Question

15. Car Instrument Simulator For this assignment you will design a set of classes that work together to simulate a car?s fuel gauge and odometer. The classes you will design are: The FuelGauge Class: This class will simulate a fuel gauge. Its responsibilities are - To know the car?s current amount of fuel, in gallons. - To report the car?s current amount of fuel, in gallons. - To be able to increment the amount of fuel by 1 gallon. This simulates putting fuel in the car. (The car can hold a maximum of 15 gallons.) - To be able to decrement the amount of fuel by 1 gallon, if the amount of fuel is greater than 0 gallons. This simulates burning fuel as the car runs. The Odometer Class: This class will simulate the car?s odometer. Its responsibilities are: - To know the car?s current mileage. - To report the car?s current mileage.- To be able to increment the current mileage by 1 mile. The maximum mileage the odometer can store is 999,999 miles. When this amount is exceeded, the odometer resets the current mileage to 0. - To be able to work with a FuelGauge object. It should decrease the FuelGauge object?s current amount of fuel by 1 gallon for every 24 miles traveled. (The car?s fuel economy is 24 miles per gallon.) Demonstrate the classes by creating instances of each. Simulate filling the car up with fuel, and then run a loop that increments the odometer until the car runs out of fuel. During each loop iteration, print the car?s current mileage and amount of fuel.

Explanation / Answer

#include <iostream>
using namespace std;

// FuelGauge Class
class FuelGauge
{
// Member variables
private:
// The amount of fuel, in gallons
int gallons;
  
// Member functions
public:
// Default constructor
FuelGauge()
{ gallons = 0;}

// Overloaded constructor that accepts
// an argument for gallons. It can hold
// no more than 15 gallons.
FuelGauge(int g)
{
if (g <= 15)
gallons = g;
else
gallons = 15;
}

// Accessor for the gallons
int getGallons()
{ return gallons;}

// The incrementGallons function increments
// the value of the gallons member, if it
// is less than 15. The car holds a maximum
// of 15 gallons.
void incrementGallons()
{
if (gallons < 15)
gallons++;
else
cout << "FUEL OVERFLOWING!!! ";
}

// The decrementGallons function decrements
// the value of the gallons member, if it
// is greater than 0.
void decrementGallons()
{
if (gallons > 0)
gallons--;
else
cout << "OUT OF GAS!!! ";
}
};

// Odometer Class
class Odometer
{
// Member variables
private:
// The current mileage
int mileage;

// Mileage set-point to remember when the
// FuelGuage gallons were decremented.
int setPoint;

// Pointer to a FuelGauge object
FuelGauge *fuelGauge;
  
// Member functions
public:
// The constructor accepts arguments
// for the mileage and the fuel guage.
Odometer(int m, FuelGauge *fp)
{ mileage = m; setPoint = m; fuelGauge = fp; }

// Accessor for the mileage
int getMileage()
{ return mileage;}

// The incrementMiles function increments
// the value of the mileage member.
void incrementMiles()
{
// Increment the mileage, but rollover
// if we go past 999,999.
if (mileage < 999999)
mileage++;
else
mileage = 0;

// See if we have burned a gallon of gas. This
// happens every 24 miles.
//
// If setPoint is greater than mileage, then
// the odometer has rolled over.
if (setPoint > mileage)
{
// Add 1 million to get the actual mileage.
int falseMileage = mileage + 1000000;

if ( (falseMileage - setPoint) >= 24 )
{
fuelGauge->decrementGallons();
setPoint = mileage;
}
}
else
{
if ( (mileage - setPoint) >= 24 )
{
fuelGauge->decrementGallons();
setPoint = mileage;
}
}
}
};

// Function prototypes

int main()
{
// Create a FuelGuage object.
FuelGauge fuel;

// Create an Odometer object to work with the FuelGauge object.
Odometer odometer(0, &fuel);

// Fill the car up with gas.
for (int i = 0; i < 15; i++)
fuel.incrementGallons();

// Drive the car until it runs out of gas.
while (fuel.getGallons() > 0)
{
// Drive a mile.
odometer.incrementMiles();

// Display the mileage.
cout << "Mileage: " << odometer.getMileage() << endl;

// Display the amount of fuel.
cout << "Fuel level: " << fuel.getGallons() << " gallons ";
cout << "------------------------------ ";
}

return 0;
}

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