[Глава 4] Упражнения 1-4

Chapter4_QuickSort/Task4_1_Sum.cs

@@ -0,0 +1,9 @@
+static class Task4_1
+{
+    public static int Calculate(int[] arr, int index = 0)
+    {
+        if (index == arr.Length - 1)
+            return arr[index];
+        return arr[index] + Calculate(arr, index+1);
+    }
+}