Data commit

Task/Averages-Mean-angle/D/averages-mean-angle.d

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+import std.stdio, std.algorithm, std.complex;
+import std.math: PI;
+
+auto radians(T)(in T d) pure nothrow @nogc { return d * PI / 180; }
+auto degrees(T)(in T r) pure nothrow @nogc { return r * 180 / PI; }
+
+real meanAngle(T)(in T[] D) pure nothrow @nogc {
+    immutable t = reduce!((a, d) => a + d.radians.expi)(0.complex, D);
+    return (t / D.length).arg.degrees;
+}
+
+void main() {
+    foreach (angles; [[350, 10], [90, 180, 270, 360], [10, 20, 30]])
+        writefln("The mean angle of %s is: %.2f degrees",
+                 angles, angles.meanAngle);
+}