import java.io.*;

/**
Support class for console input and output of numeric values.<br><br>

Example for input:<br>
&nbsp;int age = InOut.readInt("Your age: ");<br><br>
 
Example for output:<br>
&nbsp;System.out.println("price: " + InOut.format2(prize) + "Euro");<br>
&nbsp;System.out.println("percent: " + InOut.formatN(percent, 1) + " %");
*/
  

public class InOut {

  /** Formats a double-value with 2 decimal digits. */
  public static String format2(double d) {
    return String.format("%.2f", d);
  }

  /** Formats a double-value with N decimal digits. */
  public static String formatN(double d, int N) {
    return String.format("%." + N + "f", d);
  }

  /** Reads a boolean-value from console. */
  public static boolean readBoolean(String prompt) {
    final String[] trueValues =
          { "1", "y", "t", "j", "w", "yes", "true", "ja", "wahr", "ok" };
    System.out.print(prompt);
    String input = readln().toLowerCase();
    for (int i = 0; i < trueValues.length; ++i)
      if (trueValues[i].equals(input))
        return true;
    return false;
  }

  /** Reads a char-value from console. */
  public static char readChar(String prompt) {
    System.out.print(prompt);
    return readln().charAt(0);
  }

  /** Reads a double-value from console. */
  public static double readDouble(String prompt) {
    System.out.print(prompt);
    return Double.parseDouble(readln());
  }

  /** Reads a float-value from console. */
  public static float readFloat(String prompt) {
    System.out.print(prompt);
    return Float.parseFloat(readln());
  }

  /** Reads an int-value from console. */
  public static int readInt(String prompt) {
    System.out.print(prompt);
    return Integer.parseInt(readln());
  }

  /** Reads a long-value from console. */
  public static long readLong(String prompt) {
    System.out.print(prompt);
    return Long.parseLong(readln());
  }

  /** Reads a string-value from console. */
  public static String readString(String prompt) {
    System.out.print(prompt);
    return readln();
  }
  
  /** Reads a string-value from console without prompt.
     For use at the end of a console program. */
  public static String readln() {
    try {
      return Input.readLine();
    } catch(Exception e) {
      return "";
    }
  }

  private static BufferedReader Input;

  static {
    try {
      Input = new BufferedReader(new InputStreamReader(System.in));
    }
    catch (Exception e) {
      System.out.println("console input not possible.");
    }
  }



}
