//////////////////////////////////////////////////////////////
// From JAVA PROGRAMMING: FROM THE BEGINNING, by K. N. King //
// Copyright (c) 2000 W. W. Norton & Company, Inc.          //
// All rights reserved.                                     //
// This program may be freely distributed for class use,    //
// provided that this copyright notice is retained.         //
//                                                          //
// Convert.java (Appendix E, page 759)                      //
//////////////////////////////////////////////////////////////

// Provides methods to convert a string containing a number
// to double or float form

package jpb;

public class Convert {
  // Converts the string s to double form; terminates the
  // program if s does not represent a valid double value
  public static double toDouble(String s) {
    double d = 0.0;
    try {
      d = Double.valueOf(s).doubleValue();
    } catch (NumberFormatException e) {
      System.out.println("Error in Convert.toDouble: " +
                         e.getMessage());
      System.exit(-1);
    }
    return d;
  }

  // Converts the string s to float form; terminates the
  // program if s does not represent a valid float value
  public static float toFloat(String s) {
    float f = 0.0f;
    try {
      f = Float.valueOf(s).floatValue();
    } catch (NumberFormatException e) {
      System.out.println("Error in Convert.toFloat: " +
                         e.getMessage());
      System.exit(-1);
    }
    return f;
  }
}