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Re: decimal numbers

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Sat, 15 Feb 2014 10:20:35 -0700
Subject Re: decimal numbers
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On Sat, Feb 15, 2014 at 2:18 AM,  <luke.geelen@gmail.com> wrote:
> hello,
> i have been working on a python resistor calculator to let my class show what you can do with python.
> now i have a script that makes the more speekable value of the resistance (res)
>
> #if len(str(res)) > 9:
> #  res2 = res / 1000000000
> #  print "de weerstand is %s,%s giga ohms" % (res2)
> #elif len(str(res)) > 6:
> #  res2 = res / 1000000
> #  print "de weerstand is %s,%s Mega ohm" % (res2)
> #elif len(str(res)) > 3:
> #  res2 = res / 1000
> #  print "de weerstand is", res2,"kilo ohm"
> #elif len(str(res)) < 4:
> #  res2 = res
> #  print "de weerstand is", res2,"ohm"
>
> i commented it because it doesn't work (yet), when i have a resistance of
> 9.9 Giga ohms it says it is 9 giga ohms. it seems to work with natural number, anyway of using decimals insted so that it says : the resistance is 9.9 Giga Ohms instead of 9 ?

Others have already explained how to do floating-point rather than
integer division.  I'm curious to know why you're basing the if tests
on the length of the number as a string rather than on the magnitude
of the number.  Consider for example an input of 0.01.  Converted to a
string, that is "0.01" which has a length of 4.  So the output would
be "de weerstand is 0.00001 kilo ohm", which is probably not what you
would desire.

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Thread

decimal numbers luke.geelen@gmail.com - 2014-02-15 01:18 -0800
  Re: decimal numbers Luke Geelen <luke.geelen@gmail.com> - 2014-02-15 01:19 -0800
    Re: decimal numbers "Frank Millman" <frank@chagford.com> - 2014-02-15 12:04 +0200
      Re: decimal numbers Luke Geelen <luke.geelen@gmail.com> - 2014-02-15 02:32 -0800
        Re: decimal numbers "Frank Millman" <frank@chagford.com> - 2014-02-15 12:49 +0200
          Re: decimal numbers Luke Geelen <luke.geelen@gmail.com> - 2014-02-15 09:17 -0800
            Re: decimal numbers Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-15 10:23 -0700
              Re: decimal numbers Luke Geelen <luke.geelen@gmail.com> - 2014-02-15 09:42 -0800
                Re: decimal numbers Luke Geelen <luke.geelen@gmail.com> - 2014-02-15 10:57 -0800
                Re: decimal numbers Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-15 19:06 +0000
                Re: decimal numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-15 19:43 +0000
                Re: decimal numbers Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-15 14:34 -0700
                Re: decimal numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-16 02:30 +0000
                Re: decimal numbers Chris Angelico <rosuav@gmail.com> - 2014-02-16 13:36 +1100
        Re: decimal numbers "Frank Millman" <frank@chagford.com> - 2014-02-15 12:56 +0200
    Re: decimal numbers Chris Angelico <rosuav@gmail.com> - 2014-02-15 21:13 +1100
  Re: decimal numbers Laurent Pointal <laurent.pointal@free.fr> - 2014-02-15 15:52 +0100
  Re: decimal numbers Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-15 10:20 -0700
  Re: decimal numbers wxjmfauth@gmail.com - 2014-02-16 04:19 -0800

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