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Pretty cool exercise in math theory.

Code relies on two's complement integers. Certainly they are common. Still, stating that dependency is good.

% is the C remainder function. Stating that mod() is trying to mimic that and not the classical modulus function would aid in clarity.

Recommend CHAR_BIT rather than 8. @Deduplicator

Overflow can occur with all 5 functions. Suggest documenting these functions behavior in those cases.

Helper functions like multiply_recursive() could be static.

Pretty cool exercise in math theory.

Code relies on two's complement integers. Certainly they are common. Still, stating that dependency is good.

% is the C remainder function. Stating that mod() is trying to mimic that and not the classical modulus function would aid in clarity.

Recommend CHAR_BIT rather than 8. @Deduplicator

Overflow can occur with all 5 functions. Suggest documenting these functions behavior in those cases.

Helper functions like multiply_recursive() could be static.