WHEN TO USE COMP FIELD

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moon1910
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Posts: 6
Joined: Thu Jan 31, 2008 5:30 pm

WHEN TO USE COMP FIELD

Post by moon1910 » Tue Mar 25, 2008 12:33 pm

AS i am Mainframe fresher i have some problems with COMP variables..
Can anybody explain me when i Can use COMP, COMP-2 And COMP-3 data type while declaration of data??

Thanks in advance

chintu1680
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Posts: 10
Joined: Tue Dec 11, 2007 1:33 am

comp,comp-2,comp-3

Post by chintu1680 » Wed Jun 11, 2008 4:54 pm

Hai,
when u declare a data item as comp then the internal representation is in the form of pure binary . There should be no decimal points . This is generally used for the subscripts.
when u declare a data item as comp-1 or comp-2 then the internal
representation will be in floating point form . comp-1 and comp-2 are
same except that comp-2 has the more precision than comp-1 .
when we are declaring a variable as comp-1 or comp-2 no pic clause should be given.

when u declare a data-item as comp-3 then the internal representation
will be in the form of packed decimals . And each digit occupies half a byte and for sign a half byte will be taken .


for eg: 01 data-item pic s9(5)v9(3) comp-3.

this occupies a total of 4 bytes and another half byte for sign . so a total of 5 bytes.

moon1910
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Posts: 6
Joined: Thu Jan 31, 2008 5:30 pm

Post by moon1910 » Mon Jun 30, 2008 1:10 pm

Thanks chintu

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