Suppose that you have the following classes, classA and classB (10 points): /***

Question

Suppose that you have the following classes, classA and classB (10 points):

/**** Declaration of Class A****/

class classA

{

public:

void print() const;

       void doubleNum();

       classA(int a = 0);

protected:

       int x;

}

/**** Definition of Class A****/

void classA::print() const

{

                cout<< "ClassA x: " << x << endl;

}

void classA:: doubleNum ()

{

                x = 2 * x;

}

classA::classA (int a)

{

x = a;

}

/**** Declaration of Class B****/

class classB: public classA

{

    public:

      void print() const;

      void doubleNum();

      classB (int a = 0, int b = 0);

     protected:

       int y;

}

/**** Definition of Class B****/

void classB::print() const

{

      cout<<"ClassB y:" << y <<endl;

}

void classB::doubleNum()

{

       y = 2 * y;

       x= 2*x;

}

classB::classB(int a, int b)

{

                x = a;

                y = b;

}

What is the output of the following function main?

int main()

{

classA*ptrA;

       classA ObjectA(2);

       classB ObjectB(3,5);

       ptrA = &ObjectA;

       ptrA->doubleNum();

       ptrA->print();   // give the output

       cout << endl;

      ptrA = &ObjectB;

      ptrA->doubleNum();

     ptrA->print();   // give the output

      cout << endl;

      return 0;

}

Output:

What is the output of the above function main (), if the definition of classA is replaced by the following definition?

class classA

{

public:

         virtual void print() const;

        virtual void doubleNum();

         classA(int a = 0);

protected:

          int   x;

}

Output:

Explanation / Answer

1st case output:

ClassA x; 4

ClassA x: 6

2nd case output:

ClassA x: 4

ClassB y: 10

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