Csharp/CSharp Tutorial/Operator Overload/Relotional Operator Overload

Overload > and

<source lang="csharp">using System;

class TwoDimension {

 int x, y;
 
 public TwoDimension() { 
    x = y = 0; 
 }  
 public TwoDimension(int i, int j) { 
    x = i; 
    y = j;
 }  
 
 // Overload <.  
 public static bool operator <(TwoDimension op1, TwoDimension op2)  
 {  
   if((op1.x < op2.x) && (op1.y < op2.y))  
     return true;  
   else  
     return false;  
 }  
 
 // Overload >.  
 public static bool operator >(TwoDimension op1, TwoDimension op2)  
 {  
   if((op1.x > op2.x) && (op1.y > op2.y))  
     return true;  
   else  
     return false;  
 }  
 
 // Show X, Y
 public void show()  
 {  
   Console.WriteLine(x + ", " + y);  
 }  

}

class TwoDimensionDemo {

 public static void Main() {  
   TwoDimension a = new TwoDimension(5, 6);  
   TwoDimension b = new TwoDimension(10, 10);  
   TwoDimension c = new TwoDimension(1, 2);  
 
   Console.Write("Here is a: ");  
   a.show();  
   Console.Write("Here is b: ");  
   b.show();  
   Console.Write("Here is c: ");  
   c.show();  
   Console.WriteLine();  
 
   if(a > c) Console.WriteLine("a > c is true");  
   if(a < c) Console.WriteLine("a < c is true");  
   if(a > b) Console.WriteLine("a > b is true");  
   if(a < b) Console.WriteLine("a < b is true");  
 }  

}</source>

Here is a: 5, 6
Here is b: 10, 10
Here is c: 1, 2
a > c is true
a < b is true

Overloading Relational Operators

<source lang="csharp">using System; public class Employee: IComparable {

   public Employee(string name, int id)
   {
       this.name = name;
       this.id = id;
   }
   
   int IComparable.rupareTo(object obj)
   {
       Employee emp2 = (Employee) obj;
       if (this.id > emp2.id)
       return(1);
       if (this.id < emp2.id)
       return(-1);
       else
       return(0);
   }
   public static bool operator <(Employee emp1, Employee emp2)
   {
       IComparable icomp = (IComparable) emp1;
       return(icomp.rupareTo (emp2) < 0);
   }
   public static bool operator >(Employee emp1,Employee emp2)
   {
       IComparable    icomp = (IComparable) emp1;
       return(icomp.rupareTo (emp2) > 0);
   }
   public static bool operator <=(Employee emp1,Employee emp2)
   {
       IComparable    icomp = (IComparable) emp1;
       return(icomp.rupareTo (emp2) <= 0);
   }
   public static bool operator >=(Employee emp1,Employee emp2)
   {
       IComparable    icomp = (IComparable) emp1;
       return(icomp.rupareTo (emp2) >= 0);
   }
   
   public override string ToString()
   {
       return(name + ":" + id);
   }
   
   string    name;
   int    id;

} class Test {

   public static void Main()
   {
       Employee a = new Employee("A", 1);
       Employee b = new Employee("B", 2);
       Employee c = new Employee("C", 4);
       Employee d = new Employee("D", 3);
       
       Console.WriteLine("a < b: {0}", a < b);
       Console.WriteLine("c >= d: {0}", c >= d);
   }

}</source>

a < b: True
c >= d: True