Web Reference: Jul 10, 2012 · 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: While a function definition specifies how the function does what it does (the "implementation"), a function prototype merely specifies its interface, i.e. what data types go in and come out of it. Contains macros and information for adding diagnostics that aid program debugging. Contains function prototypes for functions that test characters for certain properties, and function prototypes for functions that can be used to convert lowercase letters to uppercase letters and vice versa.
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