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How to use Operator Overloading in C#?
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# −
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
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