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--- en:subroutine [2016/08/13 09:06]
admin
+++ en:subroutine [2020/02/28 10:46]
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-===== Subroutine (Statement) =====
-==== Format ====
-**subroutine** subroutine_name ( [[functionvariablelist|function_variable_list]] )\\
-(tab)[[programsyntax|statement(s)]]\\
-**end subroutine**
-==== Description ====
-Create a subroutine (or subprogram) that will receive zero or more values and process those values.  A subroutine does not return a value back to the user, it just does what you want it to do.  Execution of a subroutine will terminate and control will be returned to the "[[call|call]]ing" program when a [[Return|Return]] statement is executed or by allowing the //End Subroutine// statement to be reached.  All variables used within the subroutine, that have not been previously declared as [[global|Global]], will be local to the subroutine and will not change the values in the calling code.
-Subroutine variables may a list of zero or more, comma separated, variables.  Arrays and variables may be passed by reference using the [[Ref|Ref]] definition.
-Subroutines should be defined anywhere on your program, but can not be defined within another [[function|Function]], [[Subroutine|Subroutine]] or control block ([[ifthen|If/Then]], [[dountil|Do/Until]], ...)
-==== Example ====
-<code>
-# 100 random circles
-clg
-for x = 1 to 100
-   call draw()
-next x
-end
-function rnd(n)
-   rnd = int(rand*n)
-end function
-subroutine draw()
-   color rgb(rnd(256),rnd(256),rnd(256))
-   circle rnd(graphwidth), rnd(graphheight), rnd(graphwidth/10)
-end subroutine
-</code>
-draws\\
-{{:en:subroutine_circle.png|Circles}}
-==== See Also ====
-{{page>en:start#Program Control&noheader}}
-==== History ====
-|0.9.9.1|New To Version|

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