//  Convert.cs Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2003-08-15  File created.
//  2008-02-03  Last modification.

//  See notes at the end of this file.

using System ;

class  Conversion
{
   string  first_unit ;
   string  second_unit ;
   double  conversion_constant ;

   public Conversion( string  given_first_unit,
                      string  given_second_unit,
                      double  given_conversion_constant )
   {
      first_unit   =  given_first_unit ;
      second_unit  =  given_second_unit ;
      conversion_constant  =  given_conversion_constant ;
   }

   public void convert( string  given_unit,
                        double  amount_to_convert )
   {
      if ( first_unit.IndexOf( given_unit )  !=  -1 )
      {
         Console.Write(  "\n  "  +  amount_to_convert  +  " "
                      +  first_unit  + " is "
                      +  amount_to_convert * conversion_constant
                      +  " "  +  second_unit ) ;
      }

      if ( second_unit.IndexOf( given_unit )  !=  -1 )
      {
         Console.Write( "\n  "  +  amount_to_convert  +  " "
                      +  second_unit  + " is "
                      +  amount_to_convert / conversion_constant
                      +  " "  +  first_unit ) ;
      }
   }
}

class  ConversionApplication
{
   static void Main( string[]  command_line_parameters )
   {
      Conversion[]  conversion_table  =  new  Conversion[ 13 ] ;

      conversion_table[ 0 ] = new Conversion("meters", "yards", 1.093613 );
      conversion_table[ 1 ] = new Conversion("meters", "feet",  3.280840 );
      conversion_table[ 2 ] = new Conversion("miles",  "kilometers",1.609344);
      conversion_table[ 3 ] = new Conversion("inches", "centimeters", 2.54 );
      conversion_table[ 4 ] = new Conversion("acres",  "hectares", 0.4046873);
      conversion_table[ 5 ] = new Conversion("pounds", "kilograms",0.4535924);
      conversion_table[ 6 ] = new Conversion("ounces", "grams",    28.35 );
      conversion_table[ 7 ] = new Conversion("gallons (U.S.)","liters", 3.785);
      conversion_table[ 8 ] = new Conversion("gallons (Br.)", "liters", 4.546);
      conversion_table[ 9 ] = new Conversion("pints (U.S.)",  "liters", 0.473);
      conversion_table[ 10 ]= new Conversion("pints (Br.)",   "liters", 0.568);
      conversion_table[ 11 ]= new Conversion("joules",       "calories",4.187);
      conversion_table[ 12 ]= new Conversion("lightyears",   "kilometers",
                                                              9.461e12 ) ;
      string  unit_from_user ;
      int     amount_to_convert ;

      if ( command_line_parameters.Length  ==  2 )
      {
         unit_from_user     =  command_line_parameters[ 0 ]  ;
         amount_to_convert  =  Convert.ToInt32(
                                   command_line_parameters[ 1 ] ) ;
      }
      else
      {
         Console.Write( "\n Give the unit to convert from: " ) ;
         unit_from_user  =  Console.ReadLine() ;
         Console.Write( " Give the amount to convert:   " ) ;
         amount_to_convert  =  Convert.ToInt32( Console.ReadLine() ) ;
      }

      for ( int conversion_index  =  0 ;
                conversion_index  <  conversion_table.Length ;
                conversion_index  ++ )
      {
         conversion_table[ conversion_index ].convert( unit_from_user,
                                                         amount_to_convert ) ;
      }
   }
}

/*

//  NOTE:

//  Another possibility to build the conversion table in this program
//  is to create an initialized array of objects in the following way:

      Conversion[]  conversion_table  =

         {  new Conversion("meters", "yards", 1.093613 ),
            new Conversion("meters", "feet",  3.280840 ),
            new Conversion("miles",  "kilometers",1.609344),
            new Conversion("inches", "centimeters", 2.54 ),
            new Conversion("acres",  "hectares", 0.4046873),
            new Conversion("pounds", "kilograms",0.4535924),
            new Conversion("ounces", "grams",    28.35 ),
            new Conversion("gallons (U.S.)","liters", 3.785),
            new Conversion("gallons (Br.)", "liters", 4.546),
            new Conversion("pints (U.S.)",  "liters", 0.473),
            new Conversion("pints (Br.)",   "liters", 0.568),
            new Conversion("joules",       "calories",4.187),
            new Conversion("lightyears",   "kilometers", 9.461e12 )
         } ;



*/