Inheritance

Inheritance means deviring properties of one class into another class.

class A => Parent /Base / Super class

class B => Child /Derived /Sub-class

#include <iostream>
using namespace std;

class A
{
    public:
    void showA()
    {
        cout<<"I am showA()"<<endl;
    }
};
class B
{
    public:
    void showB()
    {
        cout<<"I am showB()"<<endl;
    }
};

int main() {
    A objA;
    objA.showA();

    B objB;
    objB.showAB();

    return 0;

}

Output

I am showA()
I am showB()

Explaination

create class A write access specifier public, create a showA() method.
print I am showA()
create another class B write access specifier public, create a showB() method.
print I am showB()
In main function create object of A class and using objA object call showA() method
In next line create object of B class and using objB object call showA() method

#include <iostream>
using namespace std;

class A
{
    public:
    void showA()
    {
        cout<<"I am showA()"<<endl;
    }
};
class B : public A
{
    public:
    void showB()
    {
        cout<<"I am showB()"<<endl;
    }
};

int main() {
   B objB;
   objB.showB();
   objB.showA();

    return 0;

}

Output

I am showA()
I am showB()

Explaination

create class A write access specifier public, create a showA() method.
print I am showA()
create another class B and inherite the properties of A and useing pulbic access specifier,
In next line write access specifier public, create a showB() method.
print I am showB()
In main function create object of B class objB.
using objB call showB() and showA() method.

Types of Inheritance

Single level inheritance
Multilevel inheritance
multiple inheritance
Hierarchical inheritance

1. Single level inheritance

The inheritance in which class B is inherited from a class A is known as Single level inheritance

#include <iostream>
using namespace std;

class A
{
    public:
    void showA()
    {
        cout<<"I am showA()"<<endl;
    }
};
class B : public A
{
    public:
    void showB()
    {
        cout<<"I am showB()"<<endl;
    }
};

int main() {
    c objC;
    objA.showA();

    B objB;
    objB.showAB();

    return 0;

}

Output

I am showA()
I am showB()

Explaination

2. Multilevel inheritance

The Multilevel inheritance means if a class A , class B and class C . class C is inherited from class B and
class B is inherited from class A is known as Multilevel inheritance.

#include <iostream>
using namespace std;

class A
{
    public:
    void showA()
    {
        cout<<"I am showA()"<<endl;
    }
};
class B : public A
{
    public:
    void showB()
    {
        cout<<"I am showB()"<<endl;
    }
};
class C : public B
{
    public:
    void showC()
    {
        cout<<"I am showC()"<<endl;
    }
};

int main() {
   C obj;
   obj.showC();
   obj.showB();
   obj.showA();

    return 0;

}

Output

I am showC()
I am showB()
I am showA()

Explaination

create class A write access specifier public, create a showA() method.
print I am showA()
create another class B and inherite the properties of A and using pulbic access specifier,
In next line write access specifier public, create a showB() method.
print I am showB()
create another class C and inherite the properties of B and using pulbic access specifier,
In main function create object of C class objC.
using objC call showC() showB() and showA() method.

3. multiple inheritance

In multiple inheritance means that a subclass can inherit from two or more superclass.

#include <iostream>
using namespace std;

class Mother
{
    public:
    void showMother()
    {
        cout<<"Mother : ABC"<<endl;
    }
};
class Father
{
    public:
    void showFather()
    {
        cout<<"Father : PQR"<<endl;
    }
};
class Child : public Mother, public Father
{
    public:
    void showChild()
    {
        cout<<" I am Child"<<endl;
    }
};

int main() {
    Child obj;
    obj.showChild();
    obj.showMother();
    obj.showFather();

    return 0;

}

Output

I am Child
Mother : ABC
Father : PQR

Explaination

create class Mother write access specifier public, create a showMother() method.
print Mother : ABC
create class Father write access specifier public, create a showFather() method.
print Father : PQR
create another class Child and inherite the properties of Mother and Father using pulbic access specifier,
In next line write access specifier public, create a showB() method.
print I am Child
In main function create object of Child class obj.
using obj call showMother() showFather() method.

4. Hierarchical inheritance

In Hierarchical inheritance class RBI is a parent class and class BOI, class SBI is a child class.

#include <iostream>
using namespace std;

class RBI
{
    public:
    void showRBI()
    {
        cout<<"According to RBI guidlines RBI is 10% "<<endl;
    }
};
class BOI : public RBI
{
    public:
    void showBank()
    {
        cout<<"I am BOI"<<endl;
    }
};
class SBI : public RBI
{
    public:
    void showBank()
    {
        cout<<"I am SBI"<<endl;
    }
};

int main() {
    BOI obj1;
    obj1.showBank();
    obj1.showRBI();

    SBI obj2;
    obj2.showBank();
    obj2.showRBI();

    return 0;

}

Output

I am BOI
According to RBI guidlines RBI is 10%
I am SBI
According to RBI guidlines RBI is 10%

Explaination

create class RBI write access specifier public, create a showRBI() method.
print According to RBI guidlines RBI is 10%
create class BOI and inherite the properties of RBI, write access specifier public, create a showBOI() method.
print I am BOI
create another class SBI and inherite the properties of RBI, write access specifier public.
In next line create a showSBI() method.
print I am SBI
In main function create object of BOI class obj1, and call showBank(), and showRBI() method
create object of SBI class obj2, and call showBank(), and showRBI() method

Inheritance

Types of Inheritance​

1. Single level inheritance​

2. Multilevel inheritance​

3. multiple inheritance​

4. Hierarchical inheritance​

Types of Inheritance

1. Single level inheritance

2. Multilevel inheritance

3. multiple inheritance

4. Hierarchical inheritance