Data commit

Task/First-class-functions/C-sharp/first-class-functions.cs

@@ -0,0 +1,22 @@
+using System;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        var cube = new Func<double, double>(x => Math.Pow(x, 3.0));
+        var croot = new Func<double, double>(x => Math.Pow(x, 1 / 3.0));
+
+        var functionTuples = new[]
+        {
+            (forward: Math.Sin, backward: Math.Asin),
+            (forward: Math.Cos, backward: Math.Acos),
+            (forward: cube,     backward: croot)
+        };
+
+        foreach (var ft in functionTuples)
+        {
+            Console.WriteLine(ft.backward(ft.forward(0.5)));
+        }
+    }
+}