Answer Posted / arati pradhan

A function declared with the keyword virtual, termed as
virtual function.It is used for runtime polymorphism. When
a function is declared as virtual function, the function of
that object is invoked which is refernced by the base
pointer.

Example-
class BASE
{
public:
virtual void show()
{
cout<<"withen base";
}
};
class DERIVED:public BASE
{
public:
void show()
{
cout<<"withen derived";
}
};
void main()
{
BASE *b,b1;
DERIVED d1;
b=&b1;
b->show(); //call the BASE show()
b=&d1;
b->show(); //call the DERIVED show()
getch();
}

Explain how to initialize a const data member.

1138

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