import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/** Klasse Input
 *  Liest von Standardeingabe verschiedene Datentypen ein.
 *  Z.b. liest Input.in.readInteger() eine Integer ein und 
 *  gibt diese zurück.  
 *  Mit Input.in.hasSucceeded() kann abgerufen werden, ob
 *  der Einlesevorgang geglückt ist.
 * @author niki
 *
 */
public class Input 
{
	/**
	 * Speichert den Status ab.
	 */
	private boolean success;
	/**
	 * Das Einleseobjekt
	 */
	public final static Input in = new Input();
	
	private Input() {}
	
	/**
	 * War der Einlesevorgang erfolgreich?
	 * @return Ja falls true
	 */
	boolean hasSucceeded()
	{
		return success;
	}
	
	private String readLine()
	{
		success = true;
		try
		{
			BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
			return r.readLine();
		}
		catch(IOException e)
		{
			e.printStackTrace();
		}
		success = false;
		return null;
	}
	byte readByte()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Byte.parseByte(s); 
		}
		catch(NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
		}
	short readShort()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Short.parseShort(s); 
		}
		catch(NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
	int readInteger()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Integer.parseInt(s);
		}
		catch(NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
	long readLong()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Long.parseLong(s);	
		}
		catch(java.lang.NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
	float readFloat()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Float.parseFloat(s); 
		}
		catch(java.lang.NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
	double readDouble()
	{
		String s = readLine();
		try
		{
			return (s == null) ? 0 : Double.parseDouble(s); 
		}
		catch(java.lang.NumberFormatException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
	String readString()
	{
		return readLine(); 
	}
	char readCharacter()
	{
		success = true;
		try
		{
			char c = 0;
			while(c == 0)
			{
				int r = System.in.read();
				if(r == -1)
				{
					success = false;
					return 0;
				}
				
				if(r>31)
					c = (char)r;
			}
			System.in.skip(System.in.available()); // Dismiss Newline & Carriage-Return
			return c;
		}
		catch(IOException e)
		{
			e.printStackTrace();
		}
		success = false;
		return 0;
	}
}