Angle difference between two bearings: Difference between revisions
Go solution
(→{{header|Fortran}}: Ah, vector analysis...) |
(Go solution) |
||
Line 186:
1174.8381( 0.996437,-0.084339) -154146.6649(-0.918252, 0.395996) -161.510
60175.7731( 0.826820, 0.562467) 42213.0719( 0.998565,-0.053561) 37.297
</pre>
=={{header|Go}}==
'''Basic task solution:'''
One feature of this solution is that if you can rely on the input bearings being in the range -180 to 180, you don't have to use math.Mod. Another feature is the bearing type and method syntax.
<lang go>package main
import "fmt"
type bearing float64
var testCases = []struct{ b1, b2 bearing }{
{20, 45},
{-45, 45},
{-85, 90},
{-95, 90},
{-45, 125},
{-45, 145},
{29.4803, -88.6381},
{-78.3251, -159.036},
}
func main() {
for _, tc := range testCases {
fmt.Println(tc.b2.Sub(tc.b1))
}
}
func (b2 bearing) Sub(b1 bearing) bearing {
switch d := b2 - b1; {
case d < -180:
return d + 360
case d > 180:
return d - 360
default:
return d
}
}</lang>
{{out}}
<pre>
25
90
175
-175
170
-170
-118.1184
-80.7109
</pre>
'''Optional extra solution:'''
A feature here is that the function body is a one-liner sufficient for the task test cases.
<lang go>package main
import (
"fmt"
"math"
)
var testCases = []struct{ b1, b2 float64 }{
{20, 45},
{-45, 45},
{-85, 90},
{-95, 90},
{-45, 125},
{-45, 145},
{29.4803, -88.6381},
{-78.3251, -159.036},
{-70099.74233810938, 29840.67437876723},
{-165313.6666297357, 33693.9894517456},
{1174.8380510598456, -154146.66490124757},
{60175.77306795546, 42213.07192354373},
}
func main() {
for _, tc := range testCases {
fmt.Println(angleDifference(tc.b2, tc.b1))
}
}
func angleDifference(b2, b1 float64) float64 {
return math.Mod(math.Mod(b2-b1, 360)+360+180, 360) - 180
}</lang>
{{out}}
<pre>
25
90
175
-175
170
-170
-118.11840000000001
-80.71089999999998
-139.58328312338563
-72.34391851868713
-161.50295230740448
37.29885558826936
</pre>
| |||