Web Reference: Jul 10, 2012 Β· The terms function declaration and function prototypes are often used interchangeably but they are different in the purpose and their meaning. Following are the major differences between the function declaration and function prototype in C: May 12, 2025 Β· ISO/IEC 9899:2024, a.k.a. C23, is the current revision of the C standard. The latest WD of C23 (n3149, 2023-07-09, a password-protected zip archive, see n3150). The closest publicly accessible draft to the C23 is the first C2Y draft (n3220, 2024-02-22, which differs from C23 only in editorial changes, see n3221). In C17 and earlier, K&R function prototypes were deprecated but still allowed. In C23 K&R prototypes are no longer allowed. Fix: rewrite any K&R prototypes as ANSI/ISO prototypes. In C17 and earlier you'd have to use __attribute__((unused)) on an unused function parameter.
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