Inheritance in c++

Inheritance

Defination:

               In General,Inheritance means that inherit something from parents like inherited property, inherits eyes color from your parents etc.In Programming , inheritance mean define a class in term of other class it will increase the Re-useability of functionality of that class thats why inheritance is very important in Object-Oreinted Programming Languages.

                                             As i told you before inheritance is "Define a class in term of another class" what is that mean.It mean you already created a class and you wanna create a new one class having same members and attributes so are you going to create a new one instead of using these member function and attribute that you already have? Your Code must be Compact but comprehensive. So lets discuss about Base Class & Derived Class .

Base Class:

                  A class that you already created lets Suppose you have created a class name "A"

Derived Class:

                   A class that you just derived from base class we can call this relation "IS a" relation

 because Derived class IS a part of Based class. i.e.. dog IS-A Animal, Cat is a black

Look at this Example:

"Dog is Inherited from Animal class"

Example with Program

"Addition.h"      //header file//

#include<iostream>

using namespace std;

class A{

int a;

public:

void getval_a(int);

int get_a();

};

class B:public A{

int b,c;

public:

void getval_b(int);

void add();//c=b+get_a()

void disp_val();//cout<<c;

};

void A::getval_a(int x){

a=x;

}

int A::get_a(){

return a;

}

void B::getval_b(int x){

b=x;

}

void B::add(){

c=get_a()+b;

}

void B::disp_val(){

cout<<"Value of A: "<<get_a();

cout<<"\nValue of B: "<<b<<endl;

cout<<"Sum of A & B: "<<c;

}

                     //inheritance

"Addition.cpp"

#include<iostream>

#include"addition.h"

using namespace std;

int main()

{

int a,b;

B obj;

cout<<"Enter value of A"<<endl;

cin>>a;

cout<<"Enter value of B"<<endl;

  cin>>b;

  obj.getval_a(a);

  obj.getval_b(b);

obj.add();

obj.disp_val();

}

"Main.cpp"

#include<iostream>

#include"addition.h"

using namespace std;

void A::getval_a(int x){

a=x;

}

int A::get_a(){

return a;

}

void B::getval_b(int x){

b=x;

}

void B::add(){

c=get_a()+b;

}

void B::disp_val(){

cout<<"Value of A: "<<get_a();

cout<<"\nValue of B: "<<b<<endl;

cout<<"Value of C: ";

}