Web Reference: Learn how to create and call a function in C, and how to separate the declaration and the definition of the function for code optimization. See examples of function parameters, return values, and function prototypes. Jan 24, 2026 · If a function is defined after the main function or another function that uses it, then a declaration is needed before it is called. This helps the compiler recognize the function and check for correct usage. Learn how to declare, define, call and use functions in C programming language. A function is a block of organized reusable code that performs a single related action and can return a value or not.
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