From:	"Judson McClendon" <judmc123 AT bellsouth DOT net>
Newsgroups:	comp.os.msdos.djgpp,alt.comp.lang.learn.c-c++,alt.lang.basic
References:	<8E0A6B90Bjsampsonpostmasterco AT news DOT earthlink DOT net> <OdFl3.2157$xN4 DOT 20163 AT news3 DOT mia> <9APl3.1054$XG6 DOT 30509 AT dfiatx1-snr1 DOT gtei DOT net> <90_l3.4474$xN4 DOT 43628 AT news3 DOT mia> <7na84u$4d7 AT news3 DOT euro DOT net> <km2m3.3538$hy DOT 30259 AT news4 DOT mia> <7nn6i2$9il AT news3 DOT euro DOT net>
Subject:	Re: A small bussiness billing application
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Date:	Wed, 28 Jul 1999 14:47:34 -0500
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Martijn Lievaart wrote:
>
>[1] For the cobol gurus out there, what does this peace of code do
>(except for syntax errors, it has been a while since I wrote COBOL,
>you'll get the meaning)
>
>PERFORM xxxxx VARYING I FROM 1 TO 9
>                VARYING J FROM I+1 TO 10.

This is COBOL 85 PERFORM statement format 4, written like this:

    PERFORM xxxxx
        VARYING I FROM 1 BY 1 UNTIL I > 9
            AFTER J FROM I + 1 BY 1 UNTIL J > 10.

However, you cannot use the expression (I + 1) there in standard
COBOL 85; it must be a numeric literal, data name or index name.
Unfortunately, the new draft standard CD 1.5 does not permit it
either.  I would like to see COBOL accept numeric expressions
anywhere it will accept numeric literals or variables.  A
logically equivalent but correct syntax is:

    PERFORM VARYING I FROM 1 BY 1 UNTIL I > 9
        ADD 1 I GIVING TEMP
        PERFORM xxxxx VARYING J FROM TEMP BY 1 UNTIL J > 10
    END-PERFORM.

It performs paragraph (or section) xxxxx 81 times, with the
following values for I and J:

   I   J
  --  --
   1   2
   1   3
    ...
   1   9
   1  10
   2   3
   2   4
    ...
   2   9
   2  10
   3   4
    ...
   9   9
   9  10

Just the logic you would use for a bubble sort. :-)
--
Judson McClendon      judmc123 AT bellsouth DOT net  (remove numbers)
Sun Valley Systems    http://personal.bhm.bellsouth.net/~judmc
"For God so loved the world that He gave His only begotten Son, that
whoever believes in Him should not perish but have everlasting life."

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