FPA: Added .NET API calls

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/dotnet/FPRMNum.cs

@@ -0,0 +1,47 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    FPRMNum.cs
+
+Abstract:
+
+    Z3 Managed API: Floating Point Rounding Mode Numerals
+
+Author:
+
+    Christoph Wintersteiger (cwinter) 2013-06-10
+
+Notes:
+    
+--*/
+using System;
+using System.Diagnostics.Contracts;
+
+namespace Microsoft.Z3
+{
+    /// <summary>
+    /// Floatiung Point Rounding Mode Numerals
+    /// </summary>
+    [ContractVerification(true)]
+    public class FPRMNum : FPRMExpr
+    {
+
+        #region Internal
+        internal FPRMNum(Context ctx, IntPtr obj)
+            : base(ctx, obj)
+        {
+            Contract.Requires(ctx != null);
+        }
+        #endregion
+
+        /// <summary>
+        /// Returns a string representation of the numeral.
+        /// </summary>        
+        public override string ToString()
+        {
+            return Native.Z3_get_numeral_string(Context.nCtx, NativeObject);
+        }
+    }
+}