[idt] CSharp

12. Extract uppercase words from a file, extract unique words

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.IO;

namespace lrn2CSharp12
{
   class Program
   {
      static void Main( string[ ] args )
      {
         string file = "";
         string line = "";
         string[ ] words;
         List<string> upperWords = new List<string>( );
         List<string> uniqueWords = new List<string>( );


         Console.WriteLine( "Input name of a file to read and count words." );
         Console.Write( ":" );

         try
         {
            file = Console.ReadLine( );
            FileStream fs = new FileStream( file, FileMode.Open, FileAccess.Read );
            StreamReader sr = new StreamReader( fs );

            while ( !sr.EndOfStream )
            {
               line = sr.ReadLine( );
               words = null;
               if ( line.Length != 0 )
                  words = line.Split( ' ' );

               if ( words != null )
               {
                  foreach ( string w in words )
                  {
                     if ( char.IsUpper( w[ 0 ] ) )
                        upperWords.Add( w );
                     if ( !uniqueWords.Contains( w ) )
                        uniqueWords.Add( w );
                  }
               }
            }

            sr.Close( );
            fs.Close( );
         }
         catch
         {
            Console.WriteLine( "WTF?!?" );
         }

         Console.WriteLine( "Upper Words:" );
         foreach ( string s in upperWords )
         {
            Console.Write( s );
            Console.WriteLine( );
         }
         Console.WriteLine( );
         Console.WriteLine( "Unique Words:" );
         foreach ( string s in uniqueWords )
         {
            Console.Write( s );
            Console.WriteLine( );
         }
         Console.WriteLine( );
         Console.WriteLine( "Press esc to exit." );
         while ( !keyPressHandler( Console.ReadKey( true ) ) )
         {
            Thread.Sleep( 250 );
            /* no op */
         }
      }

      private static Boolean keyPressHandler( ConsoleKeyInfo input )
      {
         if ( input.Key == ConsoleKey.Escape )
            return true;

         return false;
      }
   }
}

posted by dharh 1:08 AM May 30th, 2011

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 11

11. Input is HTML table, Remove all tags and put data in a comma/tab separated file.

Part of this was an exercise in looking up what others have already done.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Data;
using System.Text.RegularExpressions;
using System.Threading;

namespace lrn2CSharp11
{
   class Program
   {
      static void Main( string[ ] args )
      {
         string file = "";
         string html = "";
         DataSet ds = null;
         StringBuilder csv = new StringBuilder( );

         Console.WriteLine( "Input name of a file with an HTML table in the current directory to convert to csv." );
         Console.Write( ":" );

         try
         {
            file = Console.ReadLine( );

            FileStream fs = new FileStream( file, FileMode.Open, FileAccess.Read );
            StreamReader sr = new StreamReader( fs );

            html = sr.ReadToEnd( );
            sr.Close( );

            StreamWriter sw = new StreamWriter( fs.Name + ".csv" );
            ds = ConvertHTMLTablesToDataSet( html );

            if ( ds != null )
            {
               foreach ( DataTable dtc in ds.Tables )
               {
                  int iColCount = dtc.Columns.Count;
                  for ( int i = 0; i < iColCount; i++ )
                  {
                     sw.Write( dtc.Columns[ i ] );
                     if ( i < iColCount - 1 )
                     {
                        sw.Write( "," );
                     }
                  }
                  sw.WriteLine( );

                  foreach ( DataRow dr in dtc.Rows )
                  {
                     for ( int i = 0; i < iColCount; i++ )
                     {
                        if ( !Convert.IsDBNull( dr[ i ] ) )
                        {
                           sw.Write( dr[ i ].ToString( ) );
                        }
                        if ( i < iColCount - 1 )
                        {
                           sw.Write( "," );
                        }
                     }
                     sw.WriteLine( );
                  }
                  sw.WriteLine( );
               }
            }
            sw.Close( );
            fs.Close( );
         }
         catch
         {
            Console.WriteLine( "WTF?!?" );
         }

         Console.WriteLine( "Press esc to exit." );
         while ( !keyPressHandler( Console.ReadKey( true ) ) )
         {
            Thread.Sleep( 250 );
            /* no op */
         }
      }

      private static Boolean keyPressHandler( ConsoleKeyInfo input )
      {
         if ( input.Key == ConsoleKey.Escape )
            return true;

         return false;
      }

      private static DataSet ConvertHTMLTablesToDataSet( string HTML )
      {
         DataTable dt;
         DataSet ds = new DataSet( );
         dt = new DataTable( );
         string TableExpression = "<table[^>]*>(.*?)</table>";
         string HeaderExpression = "<th[^>]*>(.*?)</th>";
         string RowExpression = "<tr[^>]*>(.*?)</tr>";
         string ColumnExpression = "<td[^>]*>(.*?)</td>";
         bool HeadersExist = false;
         int iCurrentColumn = 0;
         int iCurrentRow = 0;

         MatchCollection Tables = Regex.Matches( 
            HTML,
            TableExpression,
            RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase
         );


         foreach ( Match Table in Tables )
         {
            iCurrentRow = 0;
            HeadersExist = false;
            dt = new DataTable( );

            if ( Table.Value.Contains( "<th" ) )
            {
               HeadersExist = true;

               MatchCollection Headers = Regex.Matches( 
                  Table.Value,
                  HeaderExpression,
                  RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase
               );

               foreach ( Match Header in Headers )
               {
                  dt.Columns.Add( Header.Groups[ 1 ].ToString( ) );
               }

            }
            else
            {

               int columns = Regex.Matches(
                  Regex.Matches(
                     Regex.Matches(
                        Table.Value,
                        TableExpression,
                        RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase 
                     )[ 0 ].ToString( ),
                     RowExpression, 
                     RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase 
                  )[ 0 ].ToString( ),
                  ColumnExpression,
                  RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase
               ).Count;

               for ( int iColumns = 1; iColumns <= columns; iColumns++ )
               {
                  dt.Columns.Add( "Column " + System.Convert.ToString( iColumns ) );
               }

            }

            MatchCollection Rows = Regex.Matches(
               Table.Value,
               RowExpression,
               RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase
            );

            foreach ( Match Row in Rows )
            {
               if ( !( ( iCurrentRow == 0 ) & HeadersExist ) )
               {
                  DataRow dr = dt.NewRow( );
                  iCurrentColumn = 0;

                  MatchCollection Columns = Regex.Matches( 
                     Row.Value,
                     ColumnExpression,
                     RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnoreCase
                  );

                  foreach ( Match Column in Columns )
                  {
                     dr[ iCurrentColumn ] = Column.Groups[ 1 ].ToString( );
                     iCurrentColumn++;
                  }

                  dt.Rows.Add( dr );
               }
               iCurrentRow++;
            }
            ds.Tables.Add( dt );

         }

         return ds;
      }
   }
}

posted by dharh 11:42 PM May 29th, 2011

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 10

10. Create files with date and time stamp appended to the name

Note: Windows does not like ':' in file names. Also I made this extension friendly so it doesn't just add a date time stamp at the end of an html file for example and instead puts the stamp just before the '.'

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace lrn2CSharp10
{
   class Program
   {
      static void Main( string[ ] args )
      {
         string fileName = "";
         string timestamp = DateTime.Now.ToString( "MM-dd-yyyy_HH-mm-ss" );

         Console.WriteLine( "Input name of new file in the current directory to create (it will have the current date appended to it)." );
         Console.Write( ":" );

         try
         {
            fileName = Console.ReadLine( );

            

            if ( fileName.Contains( '.' ) )
            {
               string scope = fileName.Split( '.' ).Last( ).ToLower( );
               fileName = fileName.Replace( "." + scope, "_" + timestamp + "." + scope );
            }
            else
            {
               fileName += "_" + timestamp;
            }

            FileStream fs = new FileStream( fileName, FileMode.Create );

            fs.Close( );
         }
         catch
         {
            Console.WriteLine( "WTF?!?" );
         }
      }
   }
}

posted by dharh 3:20 PM Sep 30th, 2010

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 9

9. Time and Date : Get system time and convert it in different formats 'DD-MON-YYYY', 'mm-dd-yyyy', 'dd/mm/yy' etc.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace lrn2csharp9
{
    class Program
    {
        static void Main( string[ ] args )
        {
            DateTime now = DateTime.Now;

            Console.WriteLine( "Today's date is: " + now.ToString( "MMM dd yyyy HH:mm:ss" ) );

            Console.WriteLine( "Also: " + now.ToString( "dd-MMM-yyyy" ) );

            Console.WriteLine( "And: " + now.ToString( "MM-d-yyyy" ) );

            Console.WriteLine( "One more thing: " + now.ToString( "d/MM/yy" ) );
        }
    }
}

posted by dharh 3:03 PM Sep 30th, 2010

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 8

8. Open a text file and convert it into HTML file. (File operations/Strings)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace lrn2csharp8
{
    class Program
    {
        static void Main( string[ ] args )
        {
            string file = "";
            string html = "<html><head><title></title></head><body>{0}</body></htm>";
            string textFile = "";

            Console.WriteLine( "Input name of a file in the current directory to convert into an HTML document." );
            Console.Write( ":" );

            try
            {
                file = Console.ReadLine( );

                FileStream fs = new FileStream( file, FileMode.Open, FileAccess.Read );
                StreamReader sr = new StreamReader( fs );

                while(!sr.EndOfStream)
                {
                    string line = sr.ReadLine( );
                    if ( line.Length != 0 )
                        textFile += "<p>" + line + "</p>";
                }

                sr.Close( );


                StreamWriter sw = new StreamWriter( fs.Name + ".html" );
                sw.Write( string.Format( html, textFile ) );
                sw.Close( );
                fs.Close( );
            }
            catch ( Exception e )
            {
                Console.WriteLine( "WTF?!?" );
            }
        }
    }
}

posted by dharh 2:14 AM Jan 30th, 2010

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 7

7. Printing output in different formats (say rounding up to 5 decimal places, truncating after 4 decimal places, padding zeros to the right and left, right and left justification)(Input output operations)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace lrn2CSharp7
{
   class Program
   {
      static void Main( string[ ] args )
      {
         double theNumber;

         Console.WriteLine( "Input a number to be formatted" );
         Console.Write( ":" );

         try
         {
            theNumber = Convert.ToDouble( Console.ReadLine( ) );

            Console.WriteLine( "Original number: {0}", theNumber );
            Console.WriteLine( "Rounded up to the 5th decimal place: {0}", Math.Round( theNumber, 5 ) );
            Console.WriteLine( "Truncating after the 4th decimal place: {0}", Decimal.Truncate( Convert.ToDecimal( theNumber * 10000 ) ) / 10000 );
            Console.WriteLine( "Padding 7 zeroes on each side: {0}", String.Format( "{0:0000000.0000000}", theNumber ) );
            Console.WriteLine( "Here is a box with 20 spaces:       |                    |" );
            Console.WriteLine( "Here is the number left justified:  |{0,-20}|", theNumber );
            Console.WriteLine( "Here is the number right justified: |{0,20}|", theNumber );
         }
         catch ( FormatException fe )
         {
            Console.WriteLine( "You did not enter a valid number fool." );
         }

         Console.WriteLine( "Press esc to exit." );
         while ( !keyPressHandler( Console.ReadKey( true ) ) )
         {
            Thread.Sleep( 250 );
            /* no op */
         }
      }

      protected static Boolean keyPressHandler( ConsoleKeyInfo input )
      {
         if ( input.Key == ConsoleKey.Escape )
            return true;

         return false;
      }
   }
}

posted by dharh 9:56 PM Dec 5th, 2009

tags: programming CSharp

(comments (0) | permalink)

Learn 2 CSharp 6

6. Scientific calculator supporting addition, subtraction, multiplication, division, square-root, square, cube, sin, cos, tan, Factorial, inverse, modulus

This is a fairly simple implementation of a console calculator. It only takes 2 number expressions ( ex: 1 + 1 ) as well as / commands for most other functions, except factorial ( n! ). Very little error checking is being done. All sorts of invalid inputs will cause this to throw exceptions.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace lrn2csharp6_console
{
    class Program
    {
        private static String Version = "0.0";

        static void Main( string[ ] args )
        {
            Console.WriteLine( "neSP: Calc v" + Version );
            Console.WriteLine( "---------------------------------" );
            Console.WriteLine( "Enter Command. ( example: /help )" );

            int end = 0;

            while ( end == 0 )
            {
                String exp = "";
                Console.Write( ":" );
                try
                {
                   exp = Console.ReadLine( );
                }
                catch ( InvalidOperationException )
                {
                    Console.WriteLine( "Not a valid command." );
                    exp = "";
                }

                if ( exp.Length == 0 )
                {
                    // empty command
                }
                else if ( exp.ToCharArray( ).First( ) == '/' )
                {
                    if ( exp.Split( ' ' ).ToString( )[ 0 ].Equals( "/help" ) )
                    {
                        Console.WriteLine( "You are being helped:" );
                        Console.WriteLine( "/help - bring up this help system." );
                        Console.WriteLine( "/quit or /q - quit program." );
                        Console.WriteLine( "/prime n - generate prime numbers from 2 to n." );
                        Console.WriteLine( "/factor numerator/denominator - factors fraction." );
                        Console.WriteLine( "/sqrt n - finds the square root of n." );
                        Console.WriteLine( "/cbrt n - finds the cube root of n." );
                        Console.WriteLine( "/sin n - finds sine of n." );
                        Console.WriteLine( "/cos n - finds cosine of n." );
                        Console.WriteLine( "/tan n - finds tangent of n." );
                        Console.WriteLine( "/inv numerator/denominator - finds inverse of fraction." );
                        Console.WriteLine( "n! - finds factorial of n." );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/quit" ) || exp.Split( ' ' )[ 0 ].Equals( "/q" ) )
                    {
                        end = 1;
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/primes" ) )
                    {
                        Console.Write( "primes:" );
                        prime( Convert.ToInt32( exp.Split( ' ' )[ 1 ] ) );
                        Console.WriteLine( );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/factor" ) )
                    {
                        
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/sqrt" ) )
                    {
                        Console.WriteLine( Math.Sqrt( Convert.ToDouble( exp.Split( ' ' )[ 1 ] ) ) );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/cbrt" ) )
                    {
                        double power = 1.0 / 3.0;
                        Console.WriteLine( Math.Pow( Convert.ToDouble( exp.Split( ' ' )[ 1 ] ), power ) );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/sin" ) )
                    {
                        Console.WriteLine( Math.Sin( Convert.ToDouble( exp.Split( ' ' )[ 1 ] ) ) );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/cos" ) )
                    {
                        Console.WriteLine( Math.Cos( Convert.ToDouble( exp.Split( ' ' )[ 1 ] ) ) );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/tan" ) )
                    {
                        Console.WriteLine( Math.Tan( Convert.ToDouble( exp.Split( ' ' )[ 1 ] ) ) );
                    }
                    else if ( exp.Split( ' ' )[ 0 ].Equals( "/inv" ) )
                    {
                        String fraction = exp.Replace( "/inv ", "" );
                        double numer = Convert.ToDouble( fraction.Split( '/' )[ 0 ] );
                        double denom = Convert.ToDouble( fraction.Split( '/' )[ 1 ] );
                        Console.WriteLine( denom / numer );
                    }
                    else
                    {
                        Console.WriteLine( "Invalid command ( " + exp + " ) supplied." );
                    }
                }
                else if ( exp.Contains( '!' ) )
                {
                    int f = Convert.ToInt32( exp.Split( '!' )[ 0 ] );
                    Console.WriteLine( f );
                    int total = 1;
                    for ( int i = 0; i < f; i++ )
                    {
                        total = total * ( i + 1 );
                    }
                    Console.WriteLine( total );
                }
                else
                {
                    calc( exp );
                }
            }
        }

        static void calc( String expression )
        {
            String[ ] stack = expression.Split( ' ' );
            Console.WriteLine( doCalc( Convert.ToDouble( stack[ 0 ] ), Convert.ToChar( stack[ 1 ] ), Convert.ToDouble( stack[ 2 ] ) ) );
        }

        static double doCalc( double left, char theOperator, double right )
        {
            double total = 0.0;

            if ( theOperator == '+' )
            {
                total = add( left, right );
            }
            else if ( theOperator == '-' )
            {
                total = subtract( left, right );
            }
            else if ( theOperator == '*' )
            {
                total = multiply( left, right );
            }
            else if ( theOperator == '/' )
            {
                total = divide( left, right );
            }
            else if ( theOperator == '^' )
            {
                total = Math.Pow( left, right );
            }
            else if ( theOperator == '%' )
            {
                total = mod( Convert.ToInt32( left ), Convert.ToInt32( right ) );
            }

            return total;
        }

        static double add( double num, double num2 )
        {
            return ( num + num2 );
        }

        static double subtract( double num, double num2 )
        {
            return ( num - num2 );
        }

        static double multiply( double num, double num2 )
        {
            return ( num * num2 );
        }

        static double divide( double num, double num2 )
        {
            if ( num2 == 0 )
            {
                Console.WriteLine( "ERROR: Division by zero." );
                return num;
            }
            else
            {
                return ( num / num2 );
            }
        }

        static int mod( int num, int num2 )
        {
            return ( num % num2 );
        }

        static void prime( int num )
        {
            int count = 0;
            for ( int _i = 2; _i < num; _i++ )
            {
                if ( !isPrime( _i ) )
                {
                    if ( ( count % 10 ) == 0 ) Console.WriteLine( );
                    Console.Write( " {0,6}", _i );
                    count++;
                }
            }
        }

        static bool isPrime( int num )
        {
            bool notPrime = false;

            for ( int k = num - 1; k > 1 && !notPrime; k-- )
            {
                if ( num % k == 0 ) notPrime = true;
            }

            return notPrime;
        }
    }
}

posted by dharh 8:46 PM Nov 29th, 2009

tags: programming CSharp

(comments (0) | permalink)

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