5. C offers two types of functions. What are they, and how are they different?
User-defined and library functions.
User-defined functions are written by me. I have the source code for them, and can change them. Library functions were written by someone else. Sometimes I don't have the source code for them, and they are supplied as an object file or as a built-in compiler function regardless.
There is a standard library defined for the C programming language, which should conform as much as possible to the standard library specification. On the other hand, I can create whatever user-defined functions I want.
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