import java.io.*;

/** The <B>Console</B> class consists of static methods that allow easy reading 

    of the basic data types <TT>double</TT>, <TT>int</TT>, and <TT>String</TT> 

    from standard input. <I>It must be placed in the same directory containing 

    the source code using it.</I><P>



     <B>Usage Example:</B>

     <PRE>

     System.out.println("Enter a double number: ");

     double x = Console.readDouble();

      System.out.println("You have entered: " + x);

      </PRE>

 

      @author Bert G. Wachsmuth 

      @version 98/03/10

      Modified on 9/9/01
      by Marco T. Morazan
      Changes: Added the readBoolean function.
               Added print blank statements in each function to echo the input.

*/

public class Console

{

   public static boolean readBoolean()

   {  String tmpX = readString().trim();

      try

      {  return (new Boolean(tmpX)).booleanValue();

      }

      catch(NumberFormatException ne)

      {  System.err.println("Not a boolean. Quitting ...");

         System.exit(-1);

         return false;

      }

   }


/** Reads a single double value from the keyboard. If there is an error, the 

    program will halt. 

    @return double  

*/

   public static double readDouble()

   {  String tmpX = readString().trim();

      try

      {  return (new Double(tmpX)).doubleValue();

      }

      catch(NumberFormatException ne)

      {  System.err.println("Not a double. Quitting ...");

         System.exit(-1);

         return 0.0;

      }

   }

/** Reads a single int value from the keyboard. If there is an error, the 

    program will halt.

    @return int 

*/

   public static int readInt()

   {  String tmpX = readString().trim();

      try

      {  return Integer.parseInt(tmpX);

      }

      catch(NumberFormatException ne)

      {  System.err.println("Not an integer. Quitting ...");

         System.exit(-1);

         return -1;

      }

   }

/** Reads a String from the keyboard until RETURN or ENTER key is pressed. 

    @return String 

*/

   public static String readString()

   {  String string = new String();

      try

      {  int cc = System.in.read();

         while (! ((cc == 13) || (cc == 10)))

         {  string += (char)cc;

            cc = System.in.read();

         }

         long dummy = System.in.skip(2);

      }

      catch(IOException e)

      {  }
      
      System.out.println(string);
      return string;

   }

}