Sub Procedures

A subroutine procedure is a sequence of ViviFire statements between the lines Sub and End.

The subroutine procedure does a task, then returns control to the code that called it (known as the “caller”). The procedure does not return a value to the caller.

Each time the procedure is called, its statements execute. They start with the first executable statement after Sub. Execution usually continues until the line End. But it can be stopped by one of the statements Exit Sub or Return.

You can make a procedure of type Sub in modules, classes, objects, and traits. It is private. It can be called only by other code in the same (1) class, (2) object, or (3) trait, or (if not one of the three) the module.

Procedures such as Sub can have arguments (constants, variables, or expressions) which the caller passes to it.

Declaration syntax

Sub sub_name [ parameter_list ]
    ' statements
End Sub

Parameter declaration

Parameters as local variables

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Calling syntax

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Example of declaration and call

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See also