Define classes Auto, Tank and Date to model an automobile with ID number, odometer, manufacture date, purchase date, miles per gallon, and drive functions, which fill the tank and drive the car respectively.

Question

What will be an ideal response?

Answer 1

```
class Date {
public:
Date() {} // default constructor
Date(int, int, int); // initializing constructor
int getMonth() const; // accessor
int getDay() const; // accessor
int getYear() const; // accessor

private:
int month, day, year;

friend istream& operator>> (istream&, Date&);
};

class Tank {
public:
Tank() {} // default constructor
Tank(double, double); // initializing constructor
double fillUp(); // fills tank and reports # gallons needed
void decrease(double); // decreases level in tank
double getCapacity() const; // accessor
double getCurrent() const; // accessor

private:
double capacity, current;

friend istream& operator>> (istream&, Tank&);
};

class Auto {
public:
Auto() {} // default constructor
Auto(int, int, const Date, const Date, double, const Tank);
// constructor with component classes
Auto(int, int, int,int,int, int,int,int, double, double, double);
// constructor with all component values
void drive(int); // adjust fuel and odometer for given miles
double fillUpTank(); // fill the tank up

private:
int ID, odometer;
Date manufacture, purchase;
double mpg;
Tank fueltank;

friend istream& operator>> (istream&, Auto&);
friend ostream& operator<< (ostream&, const Auto&);
};

```