Re: Need a sanity check, please

[Joel Cochran <jrc@xxxxxxxxxx>]

On Mon, 2004-05-24 at 16:12, Robert Clay wrote:
> We are at V5R1 so I have to jump through hoops to get things to work.  

No hoops needed :-)
> 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)

YEAR = atoi( %subst( MONTHID : 1 : 4 ) ) - 1;
MONTH = %subst( MONTHID : 5 );
PASTMONTH = %editc( YEAR : 'X' ) + MONTH ;

Or you could move it into a DS:

<psuedo-code>
d MONTH_DS        ds
d   year                                     4  0
d   month                                   2  0

 /free
     MONTH_DS = MONTHID ;
     PASTMONTH = %editc( year - 1 : 'X' ) + %editc( month : 'X' );
 /end-free

</psuedo-code>

> PASTMONTH is also (A  6).

According to the below error, PASTMONTH cannot be modified.  I know you
said it is a field in the file, but could it also be a procedure
parameter defined with CONST by any chance?  

If not, then it seems the compiler may be getting confused by the nested 
statements, 
but I don't think I've seen this before.  It could be some kind of intermediate
operation problem.

Joel
http://www.rpgnext.com