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how to reverse sign on a comp-3 field

 
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norm.flynn

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Joined: 08 Jan 2013
Posts: 20
Location: usa

PostPosted: Fri Apr 05, 2013 3:26 am    Post subject: how to reverse sign on a comp-3 field
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I have a file with a packed field, need to generate reversals, so want the input to be the same as the output with the sign reveresed, i.e multiply by -1.

Say the record is 80 bytes and the packed field starts in column 3 for a lenth of 4 bytes, with a picture of pic s9(05)v99 comp-3.

What would be the sort card to do this.

Thanks
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Skolusu

Senior Member


Joined: 07 Dec 2007
Posts: 2205
Location: San Jose

PostPosted: Fri Apr 05, 2013 4:13 am    Post subject: Reply to: how to reverse sign on a comp-3 field
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Use the following control cards.
Code:

//SYSIN    DD *
  OPTION COPY   
  INREC OVERLAY=(3:3,4,PD,MUL,-1,PD,LENGTH=4)
//*
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Bill Woodger

DFSORT Moderator


Joined: 09 Mar 2011
Posts: 7315

PostPosted: Fri Apr 05, 2013 5:28 am    Post subject: Reply to: how to reverse sign on a comp-3 field
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Or, subtract from zero:

Code:
     OPTION COPY
                                             
   INREC OVERLAY=(3:+0,
                       SUB,
                         3,4,PD,
                       TO=PD,LENGTH=4))


Subtract is faster than multiply. One day, someone will have 100 fields to reverse on a 100m-record file and benefit from it :-)
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