Implement swap_ints so the caller's two integer variables exchange values. It must do nothing when either pointer is null.
3, 99, 3Write down the input contract and the failure cases before coding.
Use your C runtime locally, then compare with solution.c.
The pointers are addresses, while *left and *right are the caller-owned integers. A temporary preserves the first value while the assignments happen. The alias check is not required for correctness here, but documents that no work is needed when both parameters name the same object.
your-solution.c.solution.c only after a real attempt.This beginner C exercise focuses on Dereferencing pointers, Mutation through addresses, Aliasing 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. Write and compile the starter in your local C environment, exercise the example and edge cases, then compare your approach with solution.c.
Attempt Swap two integers through pointers 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.