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Rounding?

• To: mathgroup at smc.vnet.net
• Subject: [mg60881] Rounding?
• From: Tom De Vries <tom_toad at telus.net>
• Date: Sat, 1 Oct 2005 02:55:59 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello everyone,

Sorry if this is an obvious question.  I'm wondering why the two results
below are different?

I'm creating programs to generate test questions, and I need to know that my
computer generated answers will match the student answers, to say, three
decimal places.  So the answer is -0.0625  "exactly", the first result makes
sense to me, the second doesn't.

If there is a reason for this, is there are way to insure I can make the
first result look like the second result all the time??


SetAccuracy[-0.0625,4]

-0.063

ToString[SetAccuracy[-0.0625,4]]

-0.062


Thanks for your input!


Tom De Vries

• Follow-Ups:
  • Re: Rounding?
    • From: Pratik Desai <pdesai1@umbc.edu>
  • Re: Rounding?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>