RE: Need a sanity check, please

["Robert Clay" <rclay@xxxxxxxxxxxx>]

I tried your suggestion but it didn't work.  Still getting the error.


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]On 
Behalf Of Martin, Steve (MAN-Golden)
Sent: Monday, May 24, 2004 12:47 PM
To: 'RPG programming on the AS400 / iSeries'
Subject: RE: Need a sanity check, please

Should you be casting the entire result to char()? // by adding overall
parenthesis
PASTMONTH = %char((atoi(%subst(MONTHID:1:4))-1) + %subst(MONTHID:5:2))
                 ^                                                   ^

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Robert Clay
Sent: Monday, May 24, 2004 10:12 AM
To: RPG400-L@xxxxxxxxxxxx
Subject: Need a sanity check, please


We are at V5R1 so I have to jump through hoops to get things to work. 

Here's the situation:

We have MONTHID  (A  6) which represents YYYYMM, where YYYY is the year and
MM is the month number.  Sample data would be '200404'.

I need to do some manipulation where this value is the key and I need to
know the same month of the previous year.  So, I came up with this EVAL
statement (in free format):


PASTMONTH = %char(atoi(%subst(MONTHID:1:4))-1) + %subst(MONTHID:5:2)


PASTMONTH is also (A  6).


I have the "atoi" C function prototyped:


h BNDDIR('QC2LE')


d atoi            PR            10I 0 ExtProc('atoi')      
d  charValue                      *   VALUE Options(*STRING)


When I attempt to compile the program, I get this message on the above EVAL
statement:

RNF0955  Item is not valid as the left-hand side of an EVAL operation.

Cause . . . . . :   The left-hand side of an EVAL operation must be an item

  that can be modified.  This means that the following cannot be on the

  left-hand side since they cannot be modified: figurative constants;

  literals; named constants; lookahead fields; entry parameters with the
CONST
  keyword specified; prototype names; certain special words and built-in

  functions. The specification is ignored.

Recovery  . . . :   Specify a variable in the left-hand side of the EVAL

  operation or remove the specification. Compile again.



PASTMONTH is not a figurative constant, literal, named constant, lookahead
field, etc.

It is a field in the file I am using:

fLUMTM     UF A E           K DISK    Rename( RLUMTM : LUMTMR ) USROPN

And, yes, I have the file opened on a prior statement due to the USROPN
keyword.

Why the error?

It's probably something simple but I just can't see it.

Any help is greatly appreciated.


Robert
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