triangle: Allow triangles where a+b == c #232
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Ah hold on. Should probably bump test version. There is none for this currently, so that means just make it 1. |
| @@ -26,9 +26,11 @@ func KindFromSides(a, b, c float64) Kind { | |||
| } | |||
| // sides are now sorted | |||
| switch { | |||
| case math.IsInf(c, 0): | |||
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someone might be confused about why you only need to check c and not a, b. comment?
These are degenerate triangles since they're really just lines, but they're still good enough under the triangle inequality (which explicitly allows a+b == c) so let's go ahead and test for them. Test for isosceles and scalene added. Equilateral is impossible. Unfortunately, now we are at risk for failing a test case of (3, Inf, Inf), since 3 + Inf == Inf, and Inf < Inf is false whereas previously the test was Inf <= Inf which is true. So we might falsely declare this triangle as isosceles when it should be NaT. So we need to add another test to make sure that our largest side isn't +Inf. Closes #231
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Test version is added so this is ready for review. |
Merged
The previous change (allow a+b == c) changes test behavior, so now's as good a time as any to add a test version. The previous version can be considered to be 0 since it isn't present, so 1 is OK to use here.
| @@ -2,6 +2,8 @@ | |||
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| package triangle | |||
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| const TestVersion = 1 | |||
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Notice that most other elements of this file (KindFromSides, Kind, Equ, etc...) have some sort of explanatory comment. I chose not to include one for TestVersion since students should have gotten the drill already from previous exercises. Let me know if you disagree.
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Thank you! |
kytrinyx
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Jan 30, 2016
triangle: Allow triangles where a+b == c
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These are degenerate triangles since they're really just lines, but
they're still good enough under the triangle inequality (which
explicitly allows a+b == c) so let's go ahead and test for them.
Test for isosceles and scalene added. Equilateral is impossible.
Closes #231