Data commit

Task/Safe-addition/C-sharp/safe-addition.cs

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+using System;
+
+namespace SafeAddition {
+    class Program {
+        static float NextUp(float d) {
+            if (d == 0.0) return float.Epsilon;
+            if (float.IsNaN(d) || float.IsNegativeInfinity(d) || float.IsPositiveInfinity(d)) return d;
+
+            byte[] bytes = BitConverter.GetBytes(d);
+            int dl = BitConverter.ToInt32(bytes, 0);
+            dl++;
+            bytes = BitConverter.GetBytes(dl);
+
+            return BitConverter.ToSingle(bytes, 0);
+        }
+
+        static float NextDown(float d) {
+            if (d == 0.0) return -float.Epsilon;
+            if (float.IsNaN(d) || float.IsNegativeInfinity(d) || float.IsPositiveInfinity(d)) return d;
+
+            byte[] bytes = BitConverter.GetBytes(d);
+            int dl = BitConverter.ToInt32(bytes, 0);
+            dl--;
+            bytes = BitConverter.GetBytes(dl);
+
+            return BitConverter.ToSingle(bytes, 0);
+        }
+
+        static Tuple<float, float> SafeAdd(float a, float b) {
+            return new Tuple<float, float>(NextDown(a + b), NextUp(a + b));
+        }
+
+        static void Main(string[] args) {
+            float a = 1.20f;
+            float b = 0.03f;
+
+            Console.WriteLine("({0} + {1}) is in the range {2}", a, b, SafeAdd(a, b));
+        }
+    }
+}