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Implement parse_quantity using strtol. Accept only a complete base-10 integer in range 0..100000, reject whitespace-only or trailing characters, and report success through the return value.
42success, 42Write down the input contract and the failure cases before coding.
Ready to run the file open above against 2 tests.
strtol provides three signals that a cast cannot: where parsing stopped, whether the value overflowed, and the signed value itself. The end-pointer loop allows harmless trailing whitespace while rejecting input that only looks numeric at the beginning.
your-solution.c.solution.c only after a real attempt.This intermediate C exercise focuses on argv validation, errno and range checks, Conversion end pointers. Its requirements define the exact behavior to implement before you write code.
Start with the displayed example input and expected output, then test a boundary case suggested by the requirements. Open your-solution.c and select Run code. The browser uses the same safe C subset as the C course, including a test harness for exercise functions.
Attempt Validate a command-line integer first. Then open the read-only solution file to compare the contract, edge-case handling, and implementation choices—not simply to copy the final code.