Easy OOP Question 10 of 208

What does the virtual keyword do?

C++ interview set · Speak this in 60–90 seconds · Faridabad & Delhi NCR

EncapsulationInheritancePolymorphismAbstraction

It enables dynamic dispatch through a vtable so the derived method runs on a base pointer.

Why interviewers care about OOP:

OOP questions separate people

who only read docs from people who shipped.

Keep it short, concrete,

and tied to C++ work.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
It enables dynamic dispatch
through a vtable so the derived method runs on a base pointer.
2
Without virtual, the compiler
binds using the static type.
3
I use virtual for
true is-a polymorphism, not for every method.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“Without virtual, the compiler binds using the static type.”

Break into beats

Withoutvirtualthecompilerbindsusing

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

It enables dynamic dispatch through a vtable so the derived method runs on a base pointer. Without virtual, the compiler binds using the static type.