Explain Multiple Inheritance With Example Program and Syntax
Multiple inheritances: - Multiple-inheritance is a
mechanism of deriving a new class from two or more base classes. In
multiple-inheritance there will be only one derived class and more than one
base class’s.
Multiple-inheritance allows us
to combine the feature of several existing classes for defining new classes.
The syntax of a derived class with multiple base classes is as follows.
Class D: Visiblity B-1, Visibility
B-2...
Using comma operator to separate the base classes,
Suppose if you create an object of a derived class then first it call the
constructor of class B-1 and then call constructor of class B-2 then call the
constructor of derived class. Similarly the first the destructor of the derived
class is called and then call the destructor of the class B-2 and then call
destructor of class B-1 to destroy the object of the derived class. The order
of calling is always depend on the order of derivation. Suppose if a base class
is derived as virtual then at first the virtual class constructor is
called then call the remaining class constructor declared in the order
class m
{
protected : int m;
public : void get m( )
{ cout<<“enter m value “;
cin>>m;
}
};
class N
{
protected: int n;
public : void getn( )
{ cout<<“enter n value”;
cin>>n;
}
};
class P: public M, public N
{
public : void display ( )
{ cout<<“m=”<<m endl;
cout<<“n=”<<n<< endl;
cout<<“mxn=”<<m*n<<endl;
}
};
void main( )
{
P p;
p.getm( );
p.getn();
p. display( );
getch( );
}
input of the above program;
enter m value = 20
enter n value =10
output of the above program m=20
n=10
m*n=200