Multiple Inheritance In C++

Multiple Inheritances In C++ is the process of deriving a new class that inherits the attributes from two or more classes.

Syntax of the Derived class:

class D : visibility B-1, visibility B-2, ?  
{  
    // Body of the class;  
}

Let’s look at a simple multiple inheritance scenario.

#include <iostream>  
using namespace std;  
class A  
{  
    protected:  
     int a;  
    public:  
    void get_a(int n)  
    {  
        a = n;  
    }  
};  
  
class B  
{  
    protected:  
    int b;  
    public:  
    void get_b(int n)  
    {  
        b = n;  
    }  
};  
class C : public A,public B  
{  
   public:  
    void display()  
    {  
        std::cout << "The value of a is : " <<a<< std::endl;  
        std::cout << "The value of b is : " <<b<< std::endl;  
        cout<<"Addition of a and b is : "<<a+b;  
    }  
};  
int main()  
{  
   C c;  
   c.get_a(10);  
   c.get_b(20);  
   c.display();  
  
    return 0;  
}

Output:

The value of a is : 10
The value of b is : 20
Addition of a and b is : 30

In the example above, class ‘C’ inherits two base classes in public mode: ‘A’ and ‘B.’

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