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Implement sum_array so it returns the sum of exactly length elements. The caller owns the array; handle a null pointer or zero length without dereferencing it.
{1, 2, 3, 4}, 410Write down the input contract and the failure cases before coding.
Ready to run the file open above against 2 tests.
An array parameter is adjusted to a pointer, so the function needs an explicit length. Checking both the pointer and length before the loop makes the empty case safe; the strict index bound prevents an off-by-one read.
your-solution.c.solution.c only after a real attempt.This beginner C exercise focuses on Array indexing, Pointer parameters, Precondition checks. 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 Sum an integer array safely 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.