moremath.java

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/*
 * cs101 Math utilities
 * $Id: MoreMath.java,v 1.1.1.1 2002/06/05 21:56:32 root Exp $
 *
 * Developed for "Rethinking CS101", a project of Lynn Andrea Stein's AP Group.
 * For more information, see <a href="http://www.ai.mit.edu/projects/cs101/">the
 * CS101 homepage</a> or email <[e-mail]>.
 *
 * Copyright (C) 1996 Massachusetts Institute of Technology.
 * Please do not redistribute without obtaining permission.
 */

package cs101.util;

/**
 * cs101.util.MoreMath is an extension of the java.lang.Math library.
 * <br>
 * Copyright 1996 Massachusetts Institute of Technology
 *
 * @author Todd C. Parnell, [e-mail]
 * @author Lynn Andrea Stein, [e-mail]
 *
 */
public class MoreMath {

  /** 
   * Generate a random int between 0 and range.  Note that if range is
   * negative, this returns a negative number.
   *
   * @param     range    desired maximum int.   
   */
  public static int randomInt(int range) 
  {
    return (int) Math.round(Math.random() * range);
  }

  /** 
   * Returns the square of the input.  No checks are made for MaxInt overflow.
   *
   * @param     x       the number to square   
   */

  public static int square(int x)
  {
    return(x * x);
  }

  /** 
   * Returns 1 if the input is positive, -1 if it is negative, and 0 otherwise.
   *
   * @param     x       the number to get the sign of
   */

  public static int sign(int x)
  {
    if(x == 0) 
      {
	return(0);
      }
    else if(x > 0)
      {
	return(1);
      }
    return(-1);
  }

  /** 
   * Prevent instantiation
   */
  private MoreMath() {}
}

/*
 * $Log: MoreMath.java,v $
 * Revision 1.1.1.1  2002/06/05 21:56:32  root
 * CS101 comes to Olin finally.
 *
 * Revision 1.5  1999/08/17 18:37:02  emarcus
 * Added sign and square methods.
 *
 * Revision 1.4  1998/07/24 17:19:30  tparnell
 * Placate new javadoc behavior
 *
 * Revision 1.3  1998/07/21 19:38:19  tparnell
 * added more javadoc & private MoreMath()
 *
 * Revision 1.2  1998/06/03 19:47:44  tparnell
 * added header, javadoc and logging
 * */