Web Reference: Jul 10, 2012 · In large programs, it is common to place function prototypes at the beginning of the code or in header files, enabling function calls to occur before the function’s actual implementation. Jan 25, 2023 · A prototype establishes the attributes of a function. Then, function calls that precede the function definition (or that occur in other source files) can be checked for argument-type and return-type mismatches. A C language function prototype is necessary when a function is called before its definition, ensuring the compiler knows its name, return type, and parameters.
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