Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: Precision
Replies: 3   Last Post: Jan 7, 2013 11:05 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Ray Koopman

Posts: 3,382
Registered: 12/7/04
Re: Precision
Posted: Jan 7, 2013 11:05 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Jan 4, 11:17 pm, Rob Ryan <tio54...@gmail.com> wrote:
> My frustration is growing. I simply want to add (for example):
> 103971.66+52282.64+2998.27. These are dollars and cents and I'd
> like to keep the cents. But when I input that line, I get 159923.
> When I input: N[(103971.66+52282.64+2998.27),20] I STILL get 159923.
> What do I do to get 159952.57? I've used "SetPrecision", etc.
> with still no result.
> I note that when I type 103971.66 and hit shift-return, the
> output is 103972. If I then type "InputForm[%]" I get 103971.66.
>
> There simply has to be an easy way to add these numbers -
> any calculator watch can do it!


If you want the cents to *always* print, use PaddedForm with an
explicit request for 2 digits to the right of the decimal point.

s = 103971.66 + 52282.64 + 2998.27
NumberForm[s,8]

159253.
159252.57

t = s + .43
NumberForm[t,8]
NumberForm[t,{8,2}]
PaddedForm[t,{8,2}]

159253.
159253.
159253.
159253.00




Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.