The Museum of HP Calculators

HP Forum Archive 15

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How it works?
Message #1 Posted by Diana I. Ramirez on 23 May 2005, 9:37 a.m.

Hi, actually I am working in my final project of numerical analisys and the theme of it, is Calculator Arithmetic. I need to know how calculators make operations inside and how calculators handle errors in operations. If you can help me with this please contact me, cause I can't find any information. Thanks.

      
Re: How it works?
Message #2 Posted by Namir on 23 May 2005, 11:37 a.m.,
in response to message #1 by Diana I. Ramirez

Hello Diana,

What level of operations are you interested in. Some of the old books on algorithms and calculators that came out in the late 70s and early 80s discuss some of these methods and how approximations are used to evalute log and trig functions. Is that what you are looking for?

Namir

      
Re: How it works?
Message #3 Posted by John Limpert on 23 May 2005, 3:52 p.m.,
in response to message #1 by Diana I. Ramirez

Most calculators use decimal (BCD) arithmetic. See http://www2.hursley.ibm.com/decimal/ for a great resource on this subject. CORDIC algorithms are commonly used for transcendental functions. Googling for CORDIC should get you started.

      
Re: How it works?
Message #4 Posted by Namir on 23 May 2005, 8:18 p.m.,
in response to message #1 by Diana I. Ramirez

check the following book (on Amazon)

Numerical Computation 1: Methods, Software, and Analysis (Numerical Computation 1 Vol. XVI) by Christoph W. Ueberhuber


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