Aspire Faculty ID #17561 · Topic: UGC NET Computer Science August 2024 (Paper II) · Just now
UGC NET Computer Science August 2024 (Paper II)

What is the output of code given below :

#include<iostream.h>

using namespace std;


class Base {

public:

    Base(){

        cout<<"Base Const";

    }


    virtual ~Base(){

        cout<<"Base dest";

    }

};


class derived : public Base {

public:

    Derived(){

        cout<<"Derived Const";

    }


    ~Derived(){

        cout<<"Derived dest";

    }

};


int main()

{

    Base *b = new Derived();

    delete b;

    return 0;

}

Solution

Step-1: Object creation


Base *b = new Derived();


Constructor order in inheritance:


Base constructor


Derived constructor


Output:


Base Const

Derived Const


Step-2: Deleting object


Base destructor is virtual, so destructors call in reverse order:


Derived destructor


Base destructor


Output:


Derived dest

Base dest


Final Output:


Base Const Derived Const Derived dest Base dest

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