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Bad arithmetic conversion when assigning a stem var


IBM Mainframe Forums -> CLIST & REXX
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Ajay Baghel

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Joined: 25 Apr 2007
Posts: 206
Location: Bangalore

PostPosted: Tue Nov 26, 2019 11:29 am
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I am reading file into stem var inrec.

"execio * diskr indd (stem inrec. finis"

last-var = inrec.1

The above assignment statement is failing with bad arithmetic conversion error.

I am able to see value 191003 correctly when I display inrec.1 using say.

Pls advise
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prino

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Joined: 07 Feb 2009
Posts: 1226
Location: Vilnius, Lithuania

PostPosted: Tue Nov 26, 2019 2:05 pm
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Show a trace, straight assignments in REXX cannot cause this error!
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Willy Jensen

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Joined: 01 Sep 2015
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PostPosted: Tue Nov 26, 2019 3:47 pm
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'last-var = inrec.1 ' means subtract value of var=inrec.1 (which would evaluate to 0 or 1) from value of last.
Change the minus sign to something else.
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Willy Jensen

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PostPosted: Tue Nov 26, 2019 5:42 pm
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Sorry, my explanation was wrong - but it is caused by the minus sign in the varname.
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sergeyken

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Joined: 29 Apr 2008
Posts: 879
Location: Maryland

PostPosted: Tue Nov 26, 2019 7:12 pm
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Willy Jensen wrote:
'last-var = inrec.1 ' means subtract value of var=inrec.1 (which would evaluate to 0 or 1) from value of last.

Even worse:

The expression last-var = inrec.1
is in fact considered as
last - (var = inrec.1)
where the comparison (var = inrec.1) is always valid; it produces either 1, or 0 (with the highest probability of 0)

Next, the current value of last is considered:

1) when last is not defined, the value is 'LAST'
An attempt to calculate 'LAST' - 1 or 'LAST' - 0 would cause "bad arithmetic conversion"

2) when last is defined as non-numeric, like last = 'Hello!', then the same result as #1: "bad arithmetic conversion"

3) when last is defined as numeric, like last = 12345, then result of subtraction would be either 12345, or 12344, and then this numeric value would tried to be considered as invalid REXX expression, or TSO command, and would cause another error.
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