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

/**
 *  A class to read strings and numbers from an input stream. This class is
 *  suitable for beginning Java programmers. It constructs the necessary
 *  buffered reader, handles I/O exceptions, and converts strings to numbers.
 *
 *@author     
 *@created    May 15, 2003
 */

public class ConsoleReader {
	/**
	 *  Constructs a console reader from an input stream such as System.in
	 *
	 *@param  inStream  an input stream
	 */
	public ConsoleReader(InputStream inStream) {
		reader = new BufferedReader
				(new InputStreamReader(inStream));
	}


	/**
	 *  Reads a line of input and converts it into an integer. The input line must
	 *  contain nothing but an integer. Not even added white space is allowed.
	 *
	 *@return    the integer that the user typed
	 */
	public int readInt() {
		String inputString = readLine();
		int n = Integer.parseInt(inputString);
		return n;
	}


	/**
	 *  Reads a line of input and converts it into a floating- point number. The
	 *  input line must contain nothing but a nunber. Not even added white space is
	 *  allowed.
	 *
	 *@return    the number that the user typed
	 */
	public double readDouble() {
		String inputString = readLine();
		double x = Double.parseDouble(inputString);
		return x;
	}


	/**
	 *  Reads a line of input. In the (unlikely) event of an IOException, the
	 *  program terminates.
	 *
	 *@return    the line of input that the user typed, null at the end of input
	 */
	public String readLine() {
		String inputLine = "";

		try {
			inputLine = reader.readLine();
		} catch (IOException e) {
			System.out.println(e);
			System.exit(1);
		}

		return inputLine;
	}


	private BufferedReader reader;
}