Automatic boxing and unboxing to pass an undetermined data type to a function

 
/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//  Obj.cs - Demonstrates automatic boxing and unboxing to pass an
//           undetermined data type to a function.
//           Compile this program with the following command line:
//               C:>csc Obj.cs
//
namespace nsObject
{
    using System;
    public class Obj
    {
        static public void Main ()
        {
            double d = 3.14159;
//  Pass a double to Square ()
            object o = Square (d);
            ShowSquare (o);
//  Pass an int to Square ()
            o = Square (42);
            ShowSquare (o);
//  Pass a float to Square ()
            o = Square (2.71828F);
            ShowSquare (o);
        }
//  Square () returns the boxed square of a value if the data type is
//  int or double. Otherwise, Square() returns a null reference
        static object Square (object o)
        {
            if (o is double)
                return ((double) o * (double) o);
            if (o is int)
                return ((int) o * (int) o);
            return (null);
        }
        static public void ShowSquare (object o)
        {
            if (Object.Equals (o, null))
                Console.WriteLine ("The object is null");
            else
                Console.WriteLine ("The square is " + o);
        }
    }
}

Related examples in the same category

1.	implicit boxing of an int
2.	explicit boxing of an int to an object
3.	explicit unboxing of an object to an int
4.	A simple boxing/unboxing example
5.	Boxing also occurs when passing values
6.	Boxing makes it possible to call methods on a value
7.	Illustrates boxing and unboxing
8.	is and Box UnBox
9.	Boxing struct object
10.	Box to object

Automatic boxing and unboxing to pass an undetermined data type to a function : Boxing Unboxing « Data Types « C# / C Sharp

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