Command to test if a variable has been defined? (universe specifically)

is there a way for subroutine to determine if a variable has been defined in the calling program?

so you don't get the run time error if you were to just do IF VAR="" THEN ....

example:

calling program

    CALL SOMESUB(VAR1, VAR2)

subroutine

   SUBROUTINE SOMESUB(VAR1, VAR2)

   VAR2=""

   IF VAR1="" THEN RETURN

But if in the calling program, there was no VAR1="..." , the subroutine will throw a run time error that "" was used.

is there a way like the php  isset()  function to test if a variable has been defined?

George

OK - Found it.

ASSIGNED()

IF ASSIGNED(VAR1)=0 THEN RETURN

George

From: mvd...@googlegroups.com <mvd...@googlegroups.com> on behalf of George Gallen <g_ga...@hotmail.com>
Sent: Wednesday, April 20, 2022 2:38 PM
To: mvd...@googlegroups.com <mvd...@googlegroups.com>
Subject: [mvdbms] Command to test if a variable has been defined? (universe specifically)

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