Data commit

Task/Entropy/Elena/entropy.elena

@@ -0,0 +1,42 @@
+import system'math;
+import system'collections;
+import system'routines;
+import extensions;
+
+extension op
+{
+    logTwo()
+        = self.ln() / 2.ln();
+}
+
+public program()
+{
+    var input := console.readLine();
+    var infoC := 0.0r;
+    var table := Dictionary.new();
+
+    input.forEach:(ch)
+    {
+        var n := table[ch];
+        if (nil == n)
+        {
+            table[ch] := 1
+        }
+        else
+        {
+            table[ch] := n + 1
+        }
+    };
+
+    var freq := 0;
+    table.forEach:(letter)
+    {
+        freq := letter.toInt().realDiv(input.Length);
+
+        infoC += (freq * freq.logTwo())
+    };
+
+    infoC *= -1;
+
+    console.printLine("The Entropy of ", input, " is ", infoC)
+}