hybrid inheritance in c++.

programs of hybrid inheritance :

// Hybrid inheritence 
#include<iostream>
using namespace std;

class A{
 int a;
 public:

 void set_a(int a1){
  a=a1;
 }
 int get_a(){
  return a;
 } 
};
class B:public A{
 int b;
 public:

 void set_b(int b1){
  b=b1;
 } 
 int get_b(){ 
  return b;
 }
};
class C: public A{
 int c;
 public:

 void set_c(int c1){
  c=c1;
 }
 void addition(){
  cout<<"\n\n addition only class A and class C "<<c+get_a();
 }
}; 
class D: public B{
 public:
 
 void addition(){
  cout<<"\n\n Addition of class A and class B in class D : "<<get_a()+get_b();
 }
}; 
int main(){
 D obj;
 obj.set_a(5);
 obj.set_b(10);
 obj.addition();

 C obj2;
 obj2.set_a(20);
 obj2.set_c(10);
 obj2.addition();
 
}

out put:

 Addition of class A and class B in class D : 15
Addition only class A and class C : 30

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