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--- en:function [2016/01/01 22:41]
127.0.0.1 external edit
+++ en:function [2020/02/28 10:46]
@@ Line 1: / Line 1: @@
-===== Function (Statement) =====
-==== Format ====
-**function** function_name ( //variable_list// )\\
-(tab)//statements//\\
-**end function**
-**function** function_name$ ( //variable_list// )\\
-(tab)//statements//\\
-**end function**
-==== Description ====
-Create a function that will receive zero or more values, process those values and return either a numeric or string value.  Return values are set by assigning the name of the function and executing a [[Return|Return]] statement or allowing the //End Function// statement to be executed.  All variables used within the function will be local to the function and will not change the values in the calling code.
-In many structured languages the return value of a function is set using the [[return|Return]] statement.  In BASIC-256 the returned value of a function is set by assigning the function name the value and either executing the [[Return|Return]] statement or reaching the end of the function.  A numeric function has the default return value of zero (0) and a string function has the default value of a zero length string ("").
-Subroutine variables may a list of zero or more, comma separated, numeric or string variables.  Arrays and variables may be passed by reference using the [[Ref|Ref]] definition.
-Functions should be defined at the bottom of your program, and can not be defined within another function, [[Subroutine|Subroutine]] or control block ([[if|If/Then]], [[do|Do/Until]], ...)
-==== Example ====
-<code>
-print double$("Hello")
-print triple(3)
-end
-function double$(a$)
-   double$ = a$ + a$
-end function
-function triple(b)
-   triple = b * 3
-   return
-   triple = 9999	# code never gets executed
-end function
-</code>
-will display\\
-<code>
-HelloHello
-</code>
-==== See Also ====
-{{page>en:start#Program Control&noheader}}
-==== History ====
-|0.9.9.1|New To Version|

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