RE: Need a sanity check, please

["Reeve" <news@xxxxxxxxxx>]

No sanity here!  Check to see if PASTMONTH ("the left-hand side") is in the
PI with CONST.

-reeve

> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-
> bounces@xxxxxxxxxxxx] On Behalf Of Robert Clay
> Sent: Monday, May 24, 2004 12:12 PM
> 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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