Managed API: Refactoring and formatting.

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

src/api/dotnet/AlgebraicNum.cs

@@ -0,0 +1,81 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    IntNum.cs
+
+Abstract:
+
+    Z3 Managed API: Int Numerals
+
+Author:
+
+    Christoph Wintersteiger (cwinter) 2012-03-20
+
+Notes:
+    
+--*/
+using System;
+using System.Diagnostics.Contracts;
+
+#if !FRAMEWORK_LT_4
+using System.Numerics;
+#endif
+
+namespace Microsoft.Z3
+{
+    /// <summary>
+    /// Algebraic numbers
+    /// </summary>
+    [ContractVerification(true)]
+    public class AlgebraicNum : ArithExpr
+    {
+        /// <summary>
+        /// Return a upper bound for a given real algebraic number. 
+        /// The interval isolating the number is smaller than 1/10^<paramref name="precision"/>.    
+        /// <seealso cref="Expr.IsAlgebraicNumber"/>   
+        /// </summary>
+        /// <param name="precision">the precision of the result</param>
+        /// <returns>A numeral Expr of sort Real</returns>
+        public RatNum ToUpper(uint precision)
+        {
+            Contract.Ensures(Contract.Result<RatNum>() != null);
+
+            return new RatNum(Context, Native.Z3_get_algebraic_number_upper(Context.nCtx, NativeObject, precision));
+        }
+
+        /// <summary>
+        /// Return a lower bound for the given real algebraic number. 
+        /// The interval isolating the number is smaller than 1/10^<paramref name="precision"/>.    
+        /// <seealso cref="Expr.IsAlgebraicNumber"/>
+        /// </summary>
+        /// <param name="precision"></param>
+        /// <returns>A numeral Expr of sort Real</returns>
+        public RatNum ToLower(uint precision)
+        {
+            Contract.Ensures(Contract.Result<RatNum>() != null);
+
+            return new RatNum(Context, Native.Z3_get_algebraic_number_lower(Context.nCtx, NativeObject, precision));
+        }
+
+        /// <summary>
+        /// Returns a string representation in decimal notation.
+        /// </summary>
+        /// <remarks>The result has at most <paramref name="precision"/> decimal places.</remarks>    
+        public string ToDecimal(uint precision)
+        {
+            Contract.Ensures(Contract.Result<string>() != null);
+
+            return Native.Z3_get_numeral_decimal_string(Context.nCtx, NativeObject, precision);
+        }
+
+        #region Internal
+        internal AlgebraicNum(Context ctx, IntPtr obj)
+            : base(ctx, obj)
+        {
+            Contract.Requires(ctx != null);
+        }
+        #endregion
+    }
+}