MultiLevel

#include<iostream>
using namespace std;

//A->B->C->Main
class A{
    public:
        int Anumber=123;

};

class B:public A
{
    public:
        int Bnumber=456;

    void displayB(){
    cout<<"Class A="<<Anumber<<endl;
}

};

class C:B
{
    public:
        int Cnumber=789;

    void displayC(){
    displayB();
    cout<<"Class A="<<Anumber<<endl;
    cout<<"Class B="<<Bnumber<<endl;
    cout<<"Class C="<<Cnumber<<endl;

}

};

int main(){
    C obj;
    obj.displayC();
    return 0;
}