Expression Evaluator / Simple Calculator

CodingSnowflakeLast reported February 2026Low Frequency

Reported: 2× across candidate reports
First seen: May 2025
Last reported: February 2026
Reported outcome: mixed

Problem Overview

Implement a simple calculator / expression evaluator. In one observed variant, you are given a series of string commands such as 'ADD 2', 'MULT 3', etc., and must process them sequentially to compute a running result. In another variant,…

1 candidate-reported follow-up — the exact probes interviewers asked, with the trigger for each
The rest of the problem statement — full requirements, constraints, and edge cases
Approach and trade-offs — what passing candidates did, and the mistakes that sink people

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Verified Source

Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.

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Interviewer Follow-ups

The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.