bc

[Brian K. White]

----- Original Message ----- 
From: "John Esak" <john at valar.com>
To: "Fplist (E-mail)" <filepro-list at seaslug.org>
Sent: Friday, January 20, 2006 8:07 AM
Subject: OT: bc


> Does anyone know how to set "bc" to calculate the same way filePro does.
> With respoect to rounding that is.
>
> filePro will give 15.36 as the value for:
>
>   aa(10,.2)="102.39" * ".15"
>
> and no matter what I do, bc gives 15.35 to the same mulitplication. I've 
> set
> precision equal to 2, 4, 9, doesn't matter. If the precision goes up, it
> just goes up without rounding. If it goes lower down to 2, it truncates. 
> Any
> way to have it not truncate but round?
>
> I like to check figures in filePro with bc and it's impossible. I've 
> scanned
> the man page, of course, but didn't see anything about rounding.
>
> John

You could use printf.
use scale=3 or higher in bc to get 3 or more decimals
then use %8.2f in printf

# printf "%8.2f" `echo "scale=3;102.39 * .15" |bc`

or saner:

# n=`echo "scale=3;102.39 * .15" |bc`
# printf "%8.2f" $n

Brian K. White  --  brian at aljex.com  --  http://www.aljex.com/bkw/
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