package io;

import java.io.*;

/**
 * Gives basic support for reading an integer, a double or a
 * string from the terminal(stdin).
 *
 * Methods read one item per line.
 *
 * @version 1.2.1, Tues May 19 1998
 * @author Rolf W. Rasmussen
 * @author Khalid A. Mughal
 * @author Michal Walicki
 */
public final class Stdio
{
    private Stdio() {};
    private static BufferedReader reader = new BufferedReader(
            new InputStreamReader(System.in)
    );
    
        /**
          Print out a string or the text representation of any other
          object to the terminal. 
         */
    public static void prompt( Object str)
    {
        System.out.print(str);
        System.out.flush();
    }

        /**
          Print out a string or the text representation of any other
          object to the terminal and skip to the next line.
         */
    public static void promptln( Object str )
    {
        System.out.println( str );
    }

  public static void prompt(int n) { prompt(new Integer(n)); }
  public static void promptln(int n) { promptln(new Integer(n)); }
        /**
         * Skip to next line on the terminal.
         */
    public static void promptln()
    {
        System.out.println( "" );
    }

  
        /**
         * Read one line of text from the terminal and return it as a string.
         */
    public static String getString()
    {
        String str;
        while (true) try {  
                return reader.readLine();
        } catch(IOException io) {
                reportError();
        }
    }

        /**
         * Read one integer value from the terminal.
         */
    public static int readInteger()
    {
        while (true) try {  
                return Integer.parseInt( reader.readLine() );
        } catch (IOException io) { 
                reportError();
        } catch(NumberFormatException nf) { 
                reportError();
        }
    }
    
        /**
         * Read one double value from the terminal.
         */
    public static double readDouble()
    {
        while (true) try {  
                return Double.valueOf( reader.readLine() ).doubleValue();
        } catch(IOException io) { 
                reportError();
        } catch(NumberFormatException nf) { 
                reportError();
        }
    }

        /**
         * Read a single 8-bit character from the terminal.
         */
    public static char read8BitChar()
    {
        while (true) try {
                return (char) reader.read();
        } catch(IOException io) { 
                reportError();
        }
    }

    private static void reportError()
    {
        promptln( "Error in input. Re-enter data." );   
    }
}