This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: Rounding off real (floating point) values - bash to awk
- From: Eliot Moss <moss at cs dot umass dot edu>
- To: cygwin at cygwin dot com
- Date: Thu, 26 Nov 2015 09:18:52 -0500
- Subject: Re: Rounding off real (floating point) values - bash to awk
- Authentication-results: sourceware.org; auth=none
- References: <CAE3taFBHyMhcGB=ux5xYVxcLM13G2JRpuTyDG-NtuSrp=eOhmQ at mail dot gmail dot com>
- Reply-to: moss at cs dot umass dot edu
On 11/26/2015 8:24 AM, Lester Anderson wrote:
Hello,
I can use a script like:
#!/bin/bash
x=3.7
# pass variable x to awk via -v (var=value)
awk -v x=$x 'BEGIN { printf "%3.0f\n", x }'
#
which returns the value 4 as expected, but are there any other methods
that can be used?
In bash this must be a string (bash uses only fixed width integers for numbers),
so you can put as many decimal places as you like. awk will treat it as a string
or floating point number, depending on context. The f output format forces conversion.
Another way is to do arithmetic; even x+0 will do it. IIRC, all numbers in awk are
doubles (IEEE 64-bit floats). The documentation on awk can tell you more about
conversions, rounding, etc.
Regards -- Eliot Moss
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple