Syntax error Difference Between Virtual and Pure Virtual Function

Difference Between Virtual and Pure Virtual Function

In this post, we will understand the difference between virtual and pure virtual functions.

Virtual Function

  • It has its own definition inside the class.

  • The base class can override a virtual function.

  • It doesn’t have a derived class.

Declaration

virtual funct_name(parameter_list) {. . . . .};

Pure Virtual Function

  • It doesn’t have a definition.

  • If a class has at least one virtual function, it can be declared abstract.

  • The derived class has to override the pure virtual function to use it.

  • A pure virtual function is specified by placing "= 0" in its declaration

Declaration

virtual funct_name(parameter_list)=0;

Following is an example −

Example

class Box {
   public:
   // pure virtual function
   virtual double getVolume() = 0;
   private:
   double length; // Length of a box
   double breadth; // Breadth of a box
   double height; // Height of a box
};
Updated on: 2021-03-24T14:11:51+05:30

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