How to use Operator Overloading in C#?

CsharpProgrammingServer Side Programming

Overloaded operators are functions with special name. The keyword operator is followed by the symbol for the operator being defined. Similar to any other function, an overloaded operator has a return type and a parameter list.

The following table shows which operators can be overloaded and which cannot −

Sr.No.Operators & Description
1+, -, !, ~, ++, --
These unary operators take one operand and can be overloaded.
2+, -, *, /, %
These binary operators take one operand and can be overloaded.
3==, !=, <, >, <=, >= 
The comparison operators can be overloaded.
4&&, ||
The conditional logical operators cannot be overloaded directly.
5+=, -=, *=, /=, %=
The assignment operators cannot be overloaded.
6=, ., ?:, ->, new, is, sizeof, typeof
These operators cannot be overloaded.

The overloaded operator is defined as −

public static Box operator+ (Box b, Box c) { }

Example

The following is an example showing how to work with Operator Overloading in C# −

 Live Demo

using System;

namespace OperatorOvlApplication {
   class Box {
      private double length; // Length of a box
      private double breadth; // Breadth of a box
      private double height; // Height of a box

      public double getVolume() {
         return length * breadth * height;
      }

      public void setLength( double len ) {
         length = len;
      }

      public void setBreadth( double bre ) {
         breadth = bre;
      }

      public void setHeight( double hei ) {
         height = hei;
      }

      // Overload + operator to add two Box objects.
      public static Box operator+ (Box b, Box c) {
         Box box = new Box();
         box.length = b.length + c.length;
         box.breadth = b.breadth + c.breadth;
         box.height = b.height + c.height;
         return box;
      }
   }

   class Tester {
      static void Main(string[] args) {
         Box Box1 = new Box(); // Declare Box1 of type Box
         Box Box2 = new Box(); // Declare Box2 of type Box
         Box Box3 = new Box(); // Declare Box3 of type Box
         double volume = 0.0; // Store the volume of a box here

         // box 1 specification
         Box1.setLength(6.0);
         Box1.setBreadth(7.0);
         Box1.setHeight(5.0);

         // box 2 specification
         Box2.setLength(12.0);
         Box2.setBreadth(13.0);
         Box2.setHeight(10.0);

         // volume of box 1
         volume = Box1.getVolume();
         Console.WriteLine("Volume of Box1 : {0}", volume);

         // volume of box 2
         volume = Box2.getVolume();
         Console.WriteLine("Volume of Box2 : {0}", volume);

         // Add two object as follows:
         Box3 = Box1 + Box2;

         // volume of box 3
         volume = Box3.getVolume();
         Console.WriteLine("Volume of Box3 : {0}", volume);
         Console.ReadKey();
      }
   }
}

Output

Volume of Box1 : 210
Volume of Box2 : 1560
Volume of Box3 : 5400
raja
Published on 07-Aug-2018 16:31:48
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