What is the output of the function main of Exercise, if the definition of classA is replac...

What is the output of the function main of Exercise, 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);private: int x;};

Exercise

Suppose that you have the following classes, classA and classB :

class classA{public :virtual void print ( ) const;void doubleNum ( );classA(int a = 0);private:int x;};void classA::print ( ) const{cout ≪ "ClassA x: " ≪ x ≪ end1;}void classA::doubleNum ( ){x = 2 * x;}classA::classA(int a){x = a;}class classB: public classA {public:void print ( ) const;void doubleNum ( );classB(int a = 0, int b = 0);private:int y;};void classB::print ( ) const {classA::print ( );cout ≪ “ClassB y: ” ≪ y ≪ end1;void classB::doubleNum(){classA::doubleNum(); y = 2 * y;}classB::classB(int a, int b): classA(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 ( );cout ≪ endl;ptrA = &objectB;ptrA->doubleNum ( );ptrA->print ( );cout ≪ endl;return 0;}