RE: Random Numbers

The random number should be a value between zero and 1 (if this API
doesn't do that, ignore what I'm saying). All you have to do is multiply
the result by your max and you'll get a value in that range.

Matt

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Douglas Palme
Sent: Friday, March 16, 2007 10:41 AM
To: 'RPG programming on the AS400 / iSeries'
Subject: Random Numbers

I have been looking for a random number generator for RPG and found an
example on IBM's website.  I know that with other languages I can
specify
that I want the random numbers that are generated to fall within a
specified
range, IE: between 1 and 1000.

Here is the code that IBM suggested:

Fseedpf    uf   e             disk    usropn            
F                                                       
Frandpf    o    e             disk    usropn            
F                                                       
DTimes            c                   const(1000)       
Dfactor           c                   const(10000000000)
D                                                       
Dstdpacked        s             15p 5                   
Dstdint           s             10i 0                   
Dstddouble        s              8f                     
Dstdfc            s             12a                     
D                                                       
Drandnum_gen      pr                  extproc('CEERAN0')
Dpr_seed                              LIKE(stdint)      
Dpr_randum                            like(stddouble)   
Dpr_fc                                like(stdfc)       
D                                                    
Dcounter          s                   like(stdint)   
D                                                    
Dseednum          s                   like(stdint)   
D                                                    
Drandnum          s                   like(stddouble)
Dfeedbackcode     s                   like(stdfc)    
D                                                    
C                   open      seedpf                 
C                   open      randpf                                   
C                                                                      
C                   read      seedrec                                  
C                   eval      seednum = %rem(seedfld:factor)           
C                   for       counter = 1 by 1 to times                
C                   callp     randnum_gen(seednum:randnum:feedbackcode)
C                   eval      randfld = randnum                        
C                   write     randrec                                  
C                   endfor                                             
C                   eval      seedfld = seednum
C                   update    seedrec          
C                   close     randpf           
C                   close     seedpf           
C                   eval      *inlr = *on      

Maybe I am blinding myself here, but with using the C API, I do not see
any
way of setting a range.

Has anyone else performed such an operation before? If so, how did you
specify the lower and upper range?
 




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