// Fig. 22.26: Equation.cs
// Class Equation that contains information about an equation.
using System.Runtime.Serialization;

[DataContract]
public class Equation
{
   // automatic property to access the left operand 
   [DataMember]
   private int Left { get; set; }

   // automatic property to access the right operand 
   [DataMember]
   private int Right { get; set; }

   // automatic property to access the result of applying
   // an operation to the left and right operands
   [DataMember]
   private int Result { get; set; }

   // automatic property to access the operation
   [DataMember]
   private string Operation { get; set; }

   // required default constructor
   public Equation()
      : this( 0, 0, "add" )
   {
      // empty body
   } // end default constructor

   // three-argument constructor for class Equation
   public Equation( int leftValue, int rightValue, string type )
   {
      Left = leftValue;
      Right = rightValue;

      switch ( type ) // perform appropriate operation
      {
         case "add": // addition
            Result = Left + Right;
            Operation = "+";
            break;
         case "subtract": // subtraction
            Result = Left - Right;
            Operation = "-";
            break;
         case "multiply": // multiplication
            Result = Left * Right;
            Operation = "*";
            break;
      } // end switch
   } // end three-argument constructor

   // return string representation of the Equation object
   public override string ToString()
   {
      return string.Format( "{0} {1} {2} = {4}", Left, Operation,
         Right, Result );
   } // end method ToString

   // property that returns a string representing left-hand side
   [DataMember]
   private string LeftHandSide
   {
      get
      {
         return string.Format( "{0} {1} {2}", Left, Operation, Right );
      } // end get
      set
      {
         // empty body
      } // end set
   } // end property LeftHandSide

   // property that returns a string representing right-hand side
   [DataMember]
   private string RightHandSide
   {
      get
      {
         return Result.ToString();
      } // end get
      set
      {
         // empty body
      } // end set
   } // end property RightHandSide
} // end class Equation

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