How it works?


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.


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?



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


check the following book (on Amazon)

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

Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime works from the traditionally TI community... debrouxl 1 1,645 12-06-2013, 09:00 PM
Last Post: Erwin Ried
  HP48GX everything works perfectly except the 'ON' key? Bruce Larrabee 5 2,056 10-22-2012, 05:41 AM
Last Post: Bruce Larrabee
  Program works in emulators but not on HP-15c hardware Marcel Samek 32 7,910 05-11-2012, 08:46 PM
Last Post: Jeff O.
  15c LE - PSE works and doesn't! Please explain! Alexander Oestert 6 1,983 09-28-2011, 03:23 PM
Last Post: Alexander Oestert
  Original 15C Keyboard Test Works With 15C LE!!! DigiGal 5 2,192 09-26-2011, 07:33 PM
Last Post: M. Joury
  WP 34S: New Release in the Works Marcus von Cube, Germany 22 5,596 08-30-2011, 03:48 PM
Last Post: Marcus von Cube, Germany
  9810 works, briefly David Ramsey 37 9,365 07-11-2011, 04:11 AM
Last Post: Tony Duell
  it's nice, it works, but what it is ? Alberto Fenini 3 1,362 02-26-2011, 04:30 PM
Last Post: BruceH
  Pil Box ... works like a charm ! Sean Connor 17 4,076 11-04-2009, 01:55 PM
Last Post: Sean Connor
  Math module d´ont works Marcelo Vanti (Brasil) 6 1,698 07-06-2009, 09:32 PM
Last Post: Mad Dog ebaycalcnut

Forum Jump: