Web Reference: Jan 24, 2026 · In C programming, functions can be grouped into two main categories: library functions and user-defined functions. Based on how they handle input and output, user-defined functions can be further classified into different types. Functions A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times. The C standard library provides numerous built-in functions that your program can call. For example, strcat () to concatenate two strings, memcpy () to copy one memory location to another location, and many more functions.
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