Hi Guys
NP92 CompareTo()
Following program is executing well. I couldn’t understand the logic behind the CompareTo(). Anyone knows please explain.
Thank you
using System;
namespace ObjComp
{
// The iteration of the Car can be ordered
// based on the CarID.
public class Car : IComparable
// State data.
private int CarID;
private string petName;
// properties.
public int ID
get { return CarID; }
set { CarID = value; }
}
public string PetName
get { return petName; }
set { petName = value; }
// Constructor set.
public Car(int id, string name)
this.CarID = id;
this.petName = name;
// IComparable implementation.
int IComparable.CompareTo(object o)
Car temp = (Car)o;
if (this.CarID > temp.CarID)
return 1;
if (this.CarID < temp.CarID)
return -1;
else
return 0;
public class CarApp
public static int Main(string[] args)
// Make an array of Car types.
Car[] myAutos = new Car[5];
myAutos[0] = new Car(123, "Rusty");
myAutos[1] = new Car(6, "Mary");
myAutos[2] = new Car(6, "Viper");
myAutos[3] = new Car(13, "NoName");
myAutos[4] = new Car(6, "Chucky");
// Now, sort them using IComparable.
Array.Sort(myAutos);
// Dump sorted array.
Console.WriteLine("***** Here is the ordered set of cars *****");
foreach (Car c in myAutos)
Console.WriteLine("{0} {1}", c.ID, c.PetName);
/*
***** Here is the ordered set of cars *****
6 Chucky
6 Mary
6 Viper
13 NoName
123 Rusty
*/