sec fixes

SplitNumber.cs

@@ -16,8 +16,15 @@ namespace Lab
             get {  return first + second; }
             set
             {
-                first = Math.Truncate(value);
-                second = Math.Abs(value - first);
+                if (double.IsNaN(value) || double.IsInfinity(value))
+                {
+                    first = 0;
+                    second = 0;
+                    return;
+                }
+
+                first = Math.Floor(value);
+                second = value - first;
 
                 second = Math.Round(second, 10);
 
@@ -31,7 +38,14 @@ namespace Lab
 
         public void Multiply(double m)
         {
-            Value = Value * m;
+            double res = Value * m;
+            if (double.IsNaN(res) || double.IsInfinity(res))
+            {
+                first = 0;
+                second = 0;
+                return;
+            }
+            Value = res;
         }
     }
 }