Overloading the Basic Unary Mathematical Operators - CSharp Custom Type

CSharp examples for Custom Type:Operator Overloading

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Introduction

The unary operators that can be overloaded are listed here: 

 UL:
 +
 -
 ++
 --
 !
 ~
 true
 false

The following code shows how to overload the + and - Unary Operators.

Demo Code

using System;/*from w  w  w  .  j  av  a2s  . c om*/
using System.Text;
public class MyCharacter
{
   private char private_ch;
   public MyCharacter() { this.ch = ' '; }
   public MyCharacter(char val) { this.ch = val; }
   public char ch
   {
      get{ return this.private_ch; }
      set{ this.private_ch = value; }
   }
   static public MyCharacter operator+ ( MyCharacter orig )
   {
      MyCharacter result = new MyCharacter();
      if( orig.ch >= 'a' && orig.ch <='z' )
         result.ch = (char) (orig.ch - 32 );
      else
         result.ch = orig.ch;
         return result;
      }
      static public MyCharacter operator- ( MyCharacter orig )
      {
         MyCharacter result = new MyCharacter();
         if( orig.ch >= 'A' && orig.ch <='Z' )
            result.ch = (char) (orig.ch + 32 );
         else
            result.ch = orig.ch;
            return result;
         }
      }
      public class myAppClass
      {
         public static void Main(String[] args)
         {
            MyCharacter aaa = new MyCharacter('g');
            MyCharacter bbb = new MyCharacter('g');
            MyCharacter ccc = new MyCharacter('G');
            MyCharacter ddd = new MyCharacter('G');
            Console.WriteLine("ORIGINAL:");
            Console.WriteLine("aaa value: {0}", aaa.ch);
            Console.WriteLine("bbb value: {0}", bbb.ch);
            Console.WriteLine("ccc value: {0}", ccc.ch);
            Console.WriteLine("ddd value: {0}", ddd.ch);
            aaa = +aaa;
            bbb = -bbb;
            ccc = +ccc;
            ddd = -ddd;
            Console.WriteLine("\n\nFINAL:");
            Console.WriteLine("aaa value: {0}", aaa.ch);
            Console.WriteLine("bbb value: {0}", bbb.ch);
            Console.WriteLine("ccc value: {0}", ccc.ch);
            Console.WriteLine("ddd value: {0}", ddd.ch);
         }
}

Result


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