Answer Posted / sandeep

Virtual keyword is used to perform the dynamic binding
instead of early binding. To be brief below is the example

Class base
{
void display()
{
cout<<"in Base";
}
}
Class derived: public base
{
void display()
{
cout<<"in derived";
}
}
void main()
{
base* ptr;

ptr = new derived;
ptr->display();
}

When we execute above program output will be displayed as
"in base", but expected output was "in derived". So compiler
was choosing member function which matches the type of the
pointer rather than the member function which matches the
content of the pointer. But when we use Virtual keyword in
base class, it perform the dynamic binding, i.e., at run
time it choose the function to execute and executes "in
derived". So when we use virtual keyword, compiler will
select the member function which matches the content of the
pointer and it will ignore the member function which matches
the type of the pointer.

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