C sharp basic #newbie

chars.cs

// chars.cs
// A listing to print out a number of characters and their numbers
//----------------------------------------------------------------

using System;

class chars
{
   public static void Main()
   {
       int ctr;
       char ch;

       Console.WriteLine("\nNumber   Value\n");

       for( ctr = 60; ctr <= 95; ctr = ctr + 1)
       {
           ch = (char) ctr;
           Console.WriteLine( "  {0}{1}", ctr, ch.ToString().PadLeft(8, ' '));
       }
   }
}

circle.cs

// circle.cs - Using variables and literals
// This program calculates some circle stuff.
// -----------------------------------------------

using System;

class variables
{
    public static void Main()
    {
        // Declare variables

        int radius = 4;
        const double PI = 3.1459;
        double circum, area;

        // Do calculations

        area = PI * radius * radius;
        circum = 2 * PI * radius;

        // Print the results

        Console.WriteLine("Radius = {0}, PI = {1}", radius, PI );
        Console.WriteLine("The area is {0}", area);
        Console.WriteLine("The circumfrance is {0}", circum);
    }
}

goto.cs

//  Score.cs    Using the goto and label statements.
//  Disclaimer: This program shows the use of goto and label
//              This is not a good use; however, it illustrates
//              the functionality of these keywords.
//--------------------------------------------------------------------

class score
{
    public static void Main()
    {
        int score = 0;
        int ctr = 0;

        System.Random rnd = new System.Random();

    Start:
        ctr++;

        if (ctr > 10)
            goto EndThis;
        else
            score = (int) rnd.Next(60,101);

        System.Console.WriteLine("{0} - You received a score of {1}",
                                 ctr, score);

        goto Start;

    EndThis:
        System.Console.WriteLine("Done with scores!");
    }
}

nested_class.cs

//  line2.cs- A class with two data members
//--------------------------------------------------------------------

class Line
{
    public class Point
    {
        public int x;
        public int y;
    }

    public Point starting = new Point();
    public Point ending = new Point();
}

class lineApp
{
    public static void Main()
    {
        Line line = new Line();

        line.starting.x = 1;
        line.starting.y = 4;
        line.ending.x = 10;
        line.ending.y = 11;

        System.Console.WriteLine("Point 1: ({0},{1})",
                                 line.starting.x, line.starting.y);
        System.Console.WriteLine("Point 2: ({0},{1})",
                                 line.ending.x, line.ending.y);
    }
}

printFileContent.cs

// ListIT.cs - program to print a listing with line numbers
//-----------------------------------------------------------

using System;
using System.IO;

class ListIT
{
    public static void Main(string[] args)
    {
        try
        {
            int ctr=0;
            if (args.Length <= 0 )
            {
                Console.WriteLine("Format: ListIT filename");
                return;
            }
            else
            {
                FileStream f = new FileStream(args[0], FileMode.Open);
                try
                {
                    StreamReader t = new StreamReader(f);
                    string line;
                    while ((line = t.ReadLine()) != null)
                    {
                        ctr++;
                        Console.WriteLine("{0}:  {1}", ctr, line);
                    }
                    f.Close();
                }
                finally
                {
                    f.Close();
                }
            }
        }
        catch (System.IO.FileNotFoundException)
        {
            Console.WriteLine ("ListIT could not find the file {0}", args[0]);
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: {0}\n\n", e);
        }
    }
}

setter_and_getter.cs

//  ex0602.cs
//-------------------------------------------

using System;

class Circle
{
    int center_x;
    int center_y;
    double _radius;

    public int x
    {
       get { return center_x; }
       set { center_x = value; }
    }
    public int y
    {
       get { return center_y; }
       set { center_y = value; }
    }
    public double radius
    {
       get { return _radius; }
       set { _radius = value; }
    }
}

class MyApp
{
   public static void Main()
   {
      Circle myCircle = new Circle();

      myCircle.x = 10;
      myCircle.y = 10;
      myCircle.radius = 8;

      Console.WriteLine("Center: ({0},{1})", myCircle.x, myCircle.y);
      Console.WriteLine("_radius: {0}", myCircle.radius);
      Console.WriteLine("Circumference: {0}", (double) (2 * 3.14159 * myCircle.radius));
   }
}

sizes.cs

// sizes.cs -- Program to tell the size of the C# variable types
//----------------------------------------------------------------

// compile with "csc /unsafe sizes.cs"

using System;

class sizes
{
   unsafe public static void Main()
   {
       Console.WriteLine("byte {0} byte(s)",    sizeof( byte ));
       Console.WriteLine("sbyte {0} byte(s)",   sizeof( sbyte ));
       Console.WriteLine("char {0} byte(s)",    sizeof( char ));
       Console.WriteLine("short {0} byte(s)",   sizeof( short ));
       Console.WriteLine("ushort {0} byte(s)",  sizeof( ushort ));
       Console.WriteLine("int {0} byte(s)",     sizeof( int ));
       Console.WriteLine("uint {0} byte(s)",    sizeof( uint ));
       Console.WriteLine("long {0} byte(s)",    sizeof( long ));
       Console.WriteLine("ulong {0} byte(s)",   sizeof( ulong ));
       Console.WriteLine("float {0} byte(s)",   sizeof( float ));
       Console.WriteLine("double {0} byte(s)",  sizeof( double ));
       Console.WriteLine("decimal {0} byte(s)", sizeof( decimal ));
       Console.WriteLine("boolean {0} byte(s)", sizeof( bool ));
   }
}

xmlapp.cs

// xmlapp.cs - A sample C# application using XML
//             documentation
//
// To get the xmlifle, run "csc /doc:xmlfile xmlapp.cs"
//-----------------------------------------------

/// <summary>
/// This is a summary describing the class.
/// </summary>

/// <remarks>
/// This is a longer comment that can be used to describe
/// the class.
/// </remarks>
class myApp
{
   /// <summary>
   /// The entry point for the application.
   /// </summary>

   /// <param name="args">A list of command line arguments</param>
    public static void Main(string[] args)
    {
        System.Console.WriteLine("An XML Documented Program");
    }
}