# [LON-CAPA-users] re: significant arithmetic

**Brad Moffat
**
lon-capa-users@mail.lon-capa.org

*Tue, 18 Nov 2008 17:15:26 -0500*

Significant figures.
Some people have expressed interest in using significant figures in
answers. Normal numerical representation tends to chop zeros after a
decimal, so calculating answers must be done with strings to preserve the
significance of the numbers.
There is a suite of functions found at
res/Selwyn/moffat/testArea/Physics/SigFigPack2.library. Editing this file
will list the functions with examples and descriptions (source is
availavble.)
A number of example problems can be found by browsing :
res/Selwyn/moffat/Basics/DiagnosticTest/.
Brad