How to calculate size of a COMP-3 and COMP variables

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How to calculate size of a COMP-3 and COMP variables

Postby prashanthreddy » Sat Apr 05, 2008 4:29 pm

Hi All,

I would like to know how to calculate the Pic size of a COMP-3 and COMP variables.
My requirement is in my COBOL program one variable is declared as S9(9)V99 COMP-3.Now i would like to declare an equivalent alpha numeric for the COMP-3 variable. wat is the Pic size of alpha numeric ( X(??)) variable.
How to calculate the size of equivalent alpha numeric for COMP-3 and also COMP ??

Thanks in advance.

regards,
Prashanth
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Re: How to calculate size of a COMP-3 and COMP variables

Postby CICS Guy » Sat Apr 05, 2008 7:32 pm

For COMP-3, it is simple..... Add up the number of 9s, add one for the sign and then divide by two and round up.....
S9(9)V99 is X'99999999999S' or six bytes
S9(8)V99 is X'09999999999S' or six bytes
S9(7)V99 is X'999999999S' or five bytes

For COMP, I suggest that you look it up yourself.
Pay attention to both the COMP (binary) and the COMP-5 (native binary)....
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Re: How to calculate size of a COMP-3 and COMP variables

Postby dick scherrer » Sat Apr 05, 2008 11:52 pm

Hello,

Now i would like to declare an equivalent alpha numeric for the COMP-3 variable.
Depending on exactly what you want to do, knowing the physical length of the comp/comp-3 variables may not be all that you need to know.

If you explain how you want to use the "equivalent alpha numeric", we may be able to offer more usable suggestions.
Hope this helps,
d.sch.
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Re: How to calculate size of a COMP-3 and COMP variables

Postby suryaprakesh » Thu Apr 10, 2008 12:18 pm

hi

the comp-3 values can be calculated by using the formula

(n/2+1)(when the number is even) for instance pic s9(4) comp-3 ,so here n is 4 by using the formula we get 3 bytes.
(n/2 +1/2) (when the number is odd) for instance pic s9(5) comp-3 sh here n is 5 and answer is also 3 bytes.

and for comp s9(1) to s9(4) - 2 bytes
s9(5)to s9(9)- 4bytes
s9(10)to s9(18) 8bytes
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Re: How to calculate size of a COMP-3 and COMP variables

Postby sinmani » Fri May 25, 2012 3:15 pm

prashanthreddy wrote:Hi All,

I would like to know how to calculate the Pic size of a COMP-3 and COMP variables.
My requirement is in my COBOL program one variable is declared as S9(9)V99 COMP-3.Now i would like to declare an equivalent alpha numeric for the COMP-3 variable. wat is the Pic size of alpha numeric ( X(??)) variable.
How to calculate the size of equivalent alpha numeric for COMP-3 and also COMP ??

Thanks in advance.

regards,
Prashanth


None of the mentioned answers are correct.
The question is declare an equivalent PIC X variable that should be 9 + 2 = PIC X (11).

The calculation which is being done in the other replies is about the bytes compiler takes to store the comp-3 variable internally to save memory.

Seniors correct me if I am wrong
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Re: How to calculate size of a COMP-3 and COMP variables

Postby Robert Sample » Fri May 25, 2012 4:37 pm

sinmani , since the original question was posted more than 4 YEARS AGO, do you really think your answer will make a difference to that person?
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Re: How to calculate size of a COMP-3 and COMP variables

Postby NicC » Fri May 25, 2012 5:01 pm

Actually 9+2+1 for the decimal point (if you want to display that as well)
The problem I have is that people can explain things quickly but I can only comprehend slowly.
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Re: How to calculate size of a COMP-3 and COMP variables

Postby sinmani » Fri May 25, 2012 7:14 pm

Robert Sample wrote:sinmani , since the original question was posted more than 4 YEARS AGO, do you really think your answer will make a difference to that person?


Hi Robert ,

It might not help the person who asked that question but it can definitely help thousands of readers who flock to this forum for gaining knowledge.
:)
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Re: How to calculate size of a COMP-3 and COMP variables

Postby BillyBoyo » Fri May 25, 2012 9:35 pm

And since the original question was so poorly worded that we don't know what was wanted... I can't exactly say it wasn't a request to know the bytes rather than the digits...
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