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https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/strcmp.3.html https://developer.apple.com/library/archive/doc

• cpeterso 4y ago
  strcmp's return value is loosely defined because some implementations return the difference between the characters in the string to avoid some conditional checks or jumps. Something like: int d = a[i] - b[i]; if (d == 0) return d;