Public bug reported:
When using both parenteses and exponents, the calculator does not always
follow standard order of operations.
Order of operations:
1) Parentheses - simplify anything possible within grouping symbols
2) Exponents - unless grouping symbols are used, only the number directly
following the carat should be treated as an exponent.
3) Multiplication or Division - whichever occurs first when reading from left
to right. Parentheses are a mathematically accepted way of representing
multiplication.
4) Addition or Subtraction - whichever occurs first when reading from left to
right.
Ex: 3^2*7 yields 63, yet 3^2(7) yields 4782969. Both * and ( ) are
acceptable mathematical tools for multiplication, so they should not
give two different results.
Ex: 250000000(1.01)^20 gives an inaccurate answer. Order of operations
is invalid. The calculator multiplies the 250000000 by the 1.01 before
utilizing the exponent. Exponents come before multiplying, and thus
1.01 should be raised to the 20th power before multiplying by 250000000.
Ex: 3^2pi should yield 9pi because exponents trump multiplication.
However, the calculator treats this as 3^(2pi), and yields 995.041644893
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gcalctool 6.4.1.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
Uname: Linux 3.2.0-39-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Thu Mar 28 19:57:12 2013
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_US.UTF-8
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gcalctool
UpgradeStatus: Upgraded to precise on 2012-12-23 (95 days ago)
** Affects: gcalctool (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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https://bugs.launchpad.net/bugs/1161670
Title:
Order of operations is incorrect for exponents and parentheses
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