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Rahul_kumar
Warnings : 2
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Joined: 24 Jun 2006
Posts: 50
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Hi,
Can I execute a section by using a perform statement in decreasing order
e.g.
01 I1 pic s99.
some value is calculated in the program for I1........
Perfrom XYZ varying I1 from I1 by -1 until I1 < 1
Kindly let me know if the above syntax will work...
Rahul |
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Robert Sample
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Joined: 06 Jun 2008
Posts: 8697
Location: Dubuque, Iowa, USA
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| There is a link to manuals at the top of this page. If you click on it, find the COBOL Language Reference manual, and read sections 6.2.27.5 and 6.2.27.10 on PERFORM VARYING, all your questions will be answered -- as long as you pay sufficient attention to what is said. |
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Rahul_kumar
Warnings : 2
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Joined: 24 Jun 2006
Posts: 50
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Checked the manual ;it says :
identifier Must be a numeric elementary item,so I guess -1 will work but I am a bit confused.
Perfrom XYZ varying I1 from I1 by -1 until I1 < 1 |
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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| Why not you just execute a test? |
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Robert Sample
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Joined: 06 Jun 2008
Posts: 8697
Location: Dubuque, Iowa, USA
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Did you notice in section 6.2.27.5 that using variables requires different variables for the VARYING and FROM phrases? identifier-2 and identifier-3 don't refer to the same variable.
Furthermore, 6.2.27.10 specifically states that non-zero numeric variables or literals are required for the BY variable, so -1 will obviously work.
As I said, pay attention to the details. |
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Phrzby Phil
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Joined: 31 Oct 2006
Posts: 1042
Location: Richmond, Virginia
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| Why not just test it already and actually learn how to learn? Experiment. |
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Rahul_kumar
Warnings : 2
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Joined: 24 Jun 2006
Posts: 50
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The table is still not in place that's why ca'nt check  |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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what a lame excuse
no need of any table to write a small program to check the syntax of ithe PERFORM statement
You could simply print the <index> inside the loop! |
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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| Well, just a suggestion - write the code, compile it , at least you'd know if there is any syntax-error with the code ...you're thinking can or can not work. |
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