Question

What is the output of this program?

    #include <iostream>
    using namespace std;
    class BaseClass 
    {
        public:
        virtual void myFunction()
        {
            cout << "1";
        }
    };
    class DerivedClass1 : public BaseClass 
    {
        public:
        void myFunction()
        {
            cout << "2";
        }
    };
   class DerivedClass2 : public DerivedClass1 
    {
        public:
        void myFunction()
        {
            cout << "3";
        }
    };
    int main()
    {
        BaseClass *p;
        BaseClass ob;
        DerivedClass1 derivedObject1;
        DerivedClass2 derivedObject2;
        p = &ob;
        p -> myFunction();
        p = &derivedObject1;
        p -> myFunction();
        p = &derivedObject2;
        p -> myFunction();
        return 0;
    }

a.

123

b.

12

c.

213

d.

321

Posted under Object Oriented Programming Using C++

Answer: (a).123

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