How to process comma separated file

 Hi 
        
I have a a stream file(comma separated between three fields) in IFS 
directory(IFS path is /etc/apps/XnP/JPMCS_AccountInfo.txt) as below:
,03354,73692845        
,03354,73692845        
,04324,613350842       
,04324,613350842       
,05446,57843260        
,05446,57843260        
,07727,13390062        
,07727,13390062        
,08726,                
,08726,835768193       
9370,09370,108404021   
10006,10006,4558586    
10006,10006,4558586    
10028,10028,20003943   
  I have to compare the field account# of MMFILE(A PF declared as input) in my 
RPGLE with first field of above comma separated file(CSFILE),
If I find exact match 
I have to evaluate XPRXP as below. If I dont find match I will ve to read next 
record of CSFILE till end of file....
  Eval      XPRXP = %trim(2nd field of CSFILE)  +
                   %trim(3rd field of CSFILE)
XPRXP is rcdfmt of flat file for which im building record...
   
  Please suggest me how to delcare the IFS file & how do I process comma 
separated file and what logic I should use in dealing with above file.
   
  Thanks for the pointers.
   
  Donna.
  
  
 

                
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