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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: 24-Mar-2021
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