How do I achieve polymorphism in C++ using virtual functions?

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Pankaj Girish Adawadkar

Step 1: Define the base class containing a virtual method. class Arithmetic { public: virtual void calc(); }; Step 2: Create the subclass. Also write the implementation of the virtual method. class Addition { public: void calc() { // logic of addition ...
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Step 1: Define the base class containing a virtual method. class Arithmetic { public: virtual void calc(); }; Step 2: Create the subclass. Also write the implementation of the virtual method. class Addition { public: void calc() { // logic of addition } }; 3) Creating pointer variable:, void main() { Arithmetic* obj1 = new Addition(); obj1-> calc(); ; read less
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Experienced Computer trainer having worked in IT sector for 20 years.

The main use of virtual function is to achieve Runtime Polymorphism. Runtime polymorphism can be achieved only through a pointer (or reference) of base class type. Also, a base class pointer can point to the objects of base class as well as to the objects of derived class.
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