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C Programming · Round 1

Question 5 of 10

Topic: Type castingDifficulty: HardBloom: Apply
Summary
Question

Design a small program that uses dynamic memory allocation as a core building block.

Result
Knowledge
60%
Delivery
72%
Technical relevancy
65%
Technical term match
55%
Your recording
Your transcript

I'd write a program that reads numbers and stores them in an array using malloc. If it gets full I realloc to double the size. At the end I free the memory.

Better answer

A growable int vector: struct with data pointer, length, capacity. push() reallocs to 2x capacity when full (amortised O(1)). Always check malloc/realloc return for NULL, free on shutdown, and zero the pointer after free to avoid double-free. Document ownership: who allocates, who frees.

Coverage
Hit 2 of 5
  • Uses malloc and realloc with doubling strategy
  • Calls free at the end
  • Checks malloc/realloc return for NULL
  • Discusses ownership / who frees
  • Mentions amortised O(1) push
Gaps
  • Did not handle allocation failure
  • No mention of zeroing pointer after free
Misconceptions
  • Implied realloc never moves the buffer