Bug 1487723 - gnome calculator doesn't handle negative numbers being raised to the power of
Summary: gnome calculator doesn't handle negative numbers being raised to the power of
Alias: None
Product: Fedora
Classification: Fedora
Component: gnome-calculator
Version: 26
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Ray Strode [halfline]
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2017-09-01 18:11 UTC by Andy P
Modified: 2018-05-29 12:23 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2018-05-29 12:23:50 UTC
Type: Bug

Attachments (Terms of Use)

Description Andy P 2017-09-01 18:11:32 UTC
Description of problem: -2 squared = -4 and -2 cubed = -8 and -2 x -2 = 4 but the desktop calculator handles -2 x -2 correctly (+4), -2 squared incorrect (-4)

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. enter -2 x -2 = (ie, press minus, then 2, then times button, then minus then 2 then =) 
2. enter minus 2 then the x squared button then = button
3. enter minus 2 then xy button then 2 button then = button

Actual results:
1. gives 4
2. give -4
3. gives -4

Expected results:
1. should be 4
2. should be 4
3. should be 4

Additional info:
it looks like x squared button and xy button handle negative numbers wrong. I put high severity because a calculator shouldn't give the wrong result to simple math problems.

Comment 1 Andy P 2017-09-02 05:59:45 UTC
I've just realised that if I put parentheses around the -2 , so that it looks like (-2) x squared then it works as expected.

I still think this is a bug because:
-2 xy 3 gives the correct -8 answer

the behaviour between
-2 x2 =
-2 xy 3 =
appears to act differently

(-2) xy 3 =
gives the same answer as
-2 xy 3 =

I think it fair to assume simple people doing simple math would expect the calculator to behave as they would expect.

I've checked lots of different software calculators and half of them get this wrong and half get this right. Several hardware calculators that I have ALL behave as I would expect. Some calculators automatically put in parentheses for you, some have a separate +- button for negative numbers which I assume is to get around this issue.

I also note that
-2**2 or -2**3 in python3 works as your calculator and gives the wrong answer and (-2)**2 and (-2)**8 works as expected so I can see what is happening here but still feel that a simple calculator program should work as simple people would expect.

Comment 2 Fedora End Of Life 2018-05-03 08:03:59 UTC
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Comment 3 Fedora End Of Life 2018-05-29 12:23:50 UTC
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26
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