Rosetta Code

Angle difference between two bearings: Difference between revisions

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m →‎JS ES6: Layout, function name
Hout (talk | contribs)
9,659 edits
m →‎{{header|Haskell}}: (layout, function name, narrowed import)
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=={{header|Haskell}}==
<lang Haskell>import Text.Printf (printf)▼
 
▲<lang Haskell>import Text.Printf
 
type Radians = Float
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angleBetweenDegrees :: Degrees -> Degrees -> Degrees
angleBetweenDegrees a b = degrees $ relBearingbearingDelta (radians a) (radians b)
 
relBearingbearingDelta :: Radians -> Radians -> Radians
relBearingbearingDelta a b -- sign * dot-product
= sign * acos ((ax * bx) + (ay * by))
where
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radians = (/ 180) . (pi *)
 
-- TEST -----------------------------------------------------------------------
main :: IO ()
main =
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displayRow (x, y) =
printf "%6.2f° + %6.2f° -> %7.2f°" x y $ angleBetweenDegrees x y</lang>
 
{{Out}}
<pre> 20.00° + 45.00° -> 25.00°
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