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C Interview Q&A

This lesson is part of C · All levels

Summary

C-language interview questions typically test understanding of core concepts such as pointer and array differences, how malloc works, stack and heap differences, and the causes of memory bugs. Answering with a small code example and technical reasoning is far more convincing than just memorizing the definition. Exercising explaining concepts in your own words prepares you for a technical session that demands clarity.

Key points

Pointers are variables containing addresses, whereas arrays are memory blocks containing elements of the same type.
Calloc initializes memory with zero and receives two parameters, unlike malloc.
The stack is automatic and fast, the heap is manual and flexible but must be self-released.
Common crash causes include dereference pointers, access beyond the index array, and double free.
Prepare code examples as well as complexity numbers such as O(1), O(n), and O(log n) to support the answer.

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