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{{Anchor|Built-in function}}
{{main|Intrinsic function}}
A ''built-in function'', or ''builtin function'', or ''intrinsic function'', is a function for which the compiler generates code at [[compile time]] or provides in a way other than for other functions.<ref>{{cite web |title=Built-in functions |url=https://www.ibm.com/docs/en/zos/2.2.0?topic=lf-built-in-functions |website=ibm.com | date=9 March 2017 |access-date=December 25, 2023}}</ref> A built-in function does not need to be defined like other functions since it is ''built in'' to the programming language.<ref>{{cite book |title=Study Material Python |date=April 2023 |page=87 |url=https://books.google.com/books?id=d0nhEAAAQBAJ&pg=PA87 |access-date=December 25, 2023}}</ref>
 
== Programming ==
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This can be called as <code>SayHello()</code>.
<ref>{{cite web |title=Small Basic Getting Started Guide: Chapter 9: Subroutines |date=17 January 2024 |url=https://social.technet.microsoft.com/wiki/contents/articles/16077.small-basic-getting-started-guide-chapter-9-subroutines.aspx |publisher=Microsoft }}</ref>
 
===Visual Basic===
 
In later versions of [[Visual Basic]] (VB), including the [[Visual Basic (.NET)|latest product line]] and [[Visual Basic (classic)|VB6]], the term ''procedure'' is used for the callable unit concept. The keyword <code>Sub</code> is used to return no value and <code>Function</code> to return a value. When used in the context of a class, a procedure is a method.
<ref>{{cite web |title=Procedures in Visual Basic |url=https://learn.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/procedures/ |website=Microsoft Learn |date=15 September 2021 |access-date=8 February 2024}}</ref>
 
Each parameter has a [[data type]] that can be specified, but if not, defaults to <code>Object</code> for later versions based on [[.NET]] and [[variant type|variant]] for [[Visual Basic 6|VB6]].<ref>{{cite web |title=Dim statement (Visual Basic) |url=https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/statements/dim-statement |website=Microsoft Learn |date=15 September 2021 |access-date=8 February 2024}}</ref>
 
VB supports parameter passing conventions [[call by value|by value]] and [[call by reference|by reference]] via the keywords <code>ByVal</code> and <code>ByRef</code>, respectively.