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A '''user-defined function''' ('''UDF''') is a [[function (programming)|function]] provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. When we talk about user define function in context of C or C++ programming language, then must understand the call by value and [https://t4tutorials.com/call-by-reference-and-call-by-value-in-c-user-define-functions/ call by reference].
==BASIC language==
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