// Fig. 9.14: Increment.cs
// readonly instance variable in a class.
public class Increment
{
   // readonly instance variable (uninitialized)
   private readonly int INCREMENT;
   private int total = 0; // total of all increments

   // constructor initializes readonly instance variable INCREMENT
   public Increment( int incrementValue )
   {
      INCREMENT = incrementValue; // initialize readonly variable (once)
   } // end Increment constructor

   // add INCREMENT to total
   public void AddIncrementToTotal()
   {
      total += INCREMENT;
   } // end method AddIncrementToTotal 

   // return string representation of an Increment object's data
   public override string ToString()
   {
      return string.Format( "total = {0}", total );
   } // end method ToString
} // end class Increment


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