What is a constructor and a destructor?
PICTURE THIS: OOP PILLARS
Simple meaning
A constructor sets up the object when it is created.
WHY — OOP instead of guessing?
Why interviewers care about OOP:
who only read docs from people who shipped.
and tied to C++ work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1A constructor sets up
the object when it is created.
- 2A destructor runs when
the object dies and should release what the object owns.
- 3If I define one
of copy, move, or destructor, I review the rule of three or five.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
A constructor sets up the object when it is created. A destructor runs when the object dies and should release what the object owns.