I got the chance through campus recruitment. It was a 45-minute tech interview over the phone. The interviewer started by introducing his role and how things work for him. He then asked an open-ended question, continued to ask follow-up questions to guide the direction, and finally asked me to implement it on Google Docs.

Given a random large number, how do you show or express it?

Let's say a number like "1234567", what other ways can you show it instead of, for example, "1,234,567"?

How many bytes does an "int" typically use?

If it's 4 bytes, how large a number can it hold?

Why are there different numbers of bytes for an integer across different machines?