using System;
public class Employee: IComparable
{
public Employee(string name, int id)
{
this.name = name;
this.id = id;
}
int IComparable.CompareTo(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.CompareTo (emp2) < 0);
}
public static bool operator >(Employee emp1,Employee emp2)
{
IComparable icomp = (IComparable) emp1;
return(icomp.CompareTo (emp2) > 0);
}
public static bool operator <=(Employee emp1,Employee emp2)
{
IComparable icomp = (IComparable) emp1;
return(icomp.CompareTo (emp2) <= 0);
}
public static bool operator >=(Employee emp1,Employee emp2)
{
IComparable icomp = (IComparable) emp1;
return(icomp.CompareTo (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);
}
}
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