problem with class and inheritance program.

[matt295]

Hi, my name is Matt Barker and I am c++ beginner. So far I have been learning C++ programming for about a month. I am kind of confused with how classes and inheritance work and was hoping you guys could help me this program.

I am given 3 classes:

The following is a specification of three classes:

Class Vehicle:

Attributes:
Age, an integer, private  The age of the vehicle
Price, a float, protected  The price of the vehicle

Behaviors:
Vehicle(), public // default constructor sets age=0, and price=0.0
~Vehicle(), public // destructor sets age=0, and price=0.0
setAge(), public // Takes an integer parameter, returns nothing
setPrice(), public // Takes a float parameter, returns nothing

getAge(), public // Takes no parameters, returns the vehicle’s age
getPrice(), public // Takes no parameters, returns the vehicle’s price

End Class Vehicle

Class Car:

Attributes:
An object of type Car has all the attributes of an
object of type Vehicle

Additionally, Cars have attributes that Vehicles do not:
RaceCarStatus, a Boolean, public  yes or no

Behaviors:
An object of type Car has all the behaviors of an object of
type Vehicle

Additionally, Cars have behaviors that Vehicles do not:
Car() // default constructor sets RaceCarStatus=false
Car() // copy constructor takes one parameter of class Car
~Car() // destructor sets RaceCarStatus=false
setRaceCarStatus(), public // Takes an boolean parameter, returns nothing
getRaceCarStatus(), public // Takes no parameters, returns the car’s race car status

End Class Car

Class Truck:

Attributes:
An object of type Truck has all the attributes of an
object of type Vehicle

Additionally, Trucks have attributes that Vehicles do not:
DieselTypeStatus, a Boolean, private  yes or no

Behaviors:
An object of type Truck has all the behaviors of an object of
type Vehicle

Additionally, Cars have behaviors that Vehicles do not:
Truck(), public // default constructor sets DieselTypeStatus=false
Truck(), public // parametric constructor takes a boolean parameter and sets DieselTypeStatus=the boolean parameter
~Truck(), public // destructor sets DieselTypeStatus=false
setDieselTypeStatus(), public //Takes a boolean parameter, returns nothing
getDieselTypeStatus(), public // Takes no parameters, returns the Truck’s diesel type status

End Class Truck



I am supposed to implement the three classes described earlier (Vehicle, Car and Truck) and write a driver function (main) in order to test them.

So far here is the code I have:
#include <iostream>
using namespace std;
Class Vehicle
{
private:
int Age; //The age of the vehicle
protected:
float Price; //The price of the vehicle

public:
Vehicle(): {} //default constructor sets age=0, and price=0.0
~Vehicle(); //destructor sets age=0, and price=0.0
setAge(); //Takes an integer parameter, returns nothing
setPrice(); //Takes a float parameter, returns nothing
int getAge(){return Age;};// Takes no parameters, returns the vehicle’s age
float getPrice(){return Price;}; // Takes no parameters, returns the vehicle’s price
};
Class Car:
{
public:
Car();
~Car();
bool RaceCarStatus;
setRaceCarStatus();
bool getRaceCarStatus(){return(RaceCarStatus;};
}
Class Truck:
{

public:
bool DieselTypeStatus;
Truck();
Truck(bool x ) {Truck=x;};
~Truck();
setDieselTypeStatus();
getDieselTypeStatus(){return DieselTypeStatus;};
}
int main()
{
Vehicle x;
cout << "Initial value for x: " << endl;
cout << "Age = " << x.getAge() << " Price= " << x.getPrice() << endl;
x.setAge(40);
x.setPrice(20000);
cout << "Modified value for x: " << endl;
cout << "Age = " << x.getAge() << " Price= " << x.getPrice() << endl;
return 0;
}

Could you guys tell me if I am doing this program right so far or correct me if I am making any errors. I am really confused on how to implement the constructors. Thanks

[Analyzer]

What do you mean implement the constructors? You mean implementing the base class constructor through the inherted class?

If thats what you mean. Here is what you do.

Class Truck{

public:

Truck( bool x)
:private-variable-from-base-class( SetValue ),  //as many as you need to private variables of base class you need to assign through Truck's constructor.... make sure to ommit the ";"

{
~~~~~Trucks regular constructor code~~~~ for example:

y = x;
}