Inheritance
When we make a class on the
basis of the existing class is known as inheritance. The existing class in
known as Base class( or parent class)
and the new class is known as derived class
( or child class)
The general form is ,
class DerivedClassName : BaseClassName
{
body of the Derived Class
}
Here we have 5 types of
inheritance
1) single inheritance
2 multilevel
3 multiple
4 hierarchial
5 hybride
single inheritance
In the case of Single
Inheritance , we derive the single derived class , on the basis of the single
base class.
# include <iostream.h>
# include <conio.h>
class A
{
int a;
public:
void setA(int i)
{
a=i;
}
void showA( )
{
cout<<"a="<<a;
}
};
class B : public A
{
int b;
public:
void setB(int j)
{
b=j;
}
void showB( )
{
cout<<"b="<<b;
}
};
void main()
{
B ob;
ob.setA(5);
ob.setB(10);
ob.showA();
ob.showB();
getch();
}
private
members :
In the case of inheritance
, the private memebers have the
following features,
(i) These
members are not directly accesable by the object
of a class.
e.g.
ob.b=10; is
Invalid
(ii) These
members will not get inherited.That is, they cannot be used in the derived class or by the object
of the derived class.
showB()
cout<<"a="<<a;
it will be invalid
public
members :
In the case of inheritance , the public
memebers have the following features,
(i) These
members are directly accesable by the object of a class.
e.g.
ob.setA(5) ; is
valid
(ii) These
members will get inherited. That is,
they can be used in the derived class or by the object of the derived class.
B ob;
ob.showA();
