Class MyNumbers

java.lang.Object
  |
  +--MyNumbers

class MyNumbers

extends java.lang.Object

Generic utility functions for MyNumbers.

Method Summary

static MyNumber	abs(MyNumber n) Returns a new MyNumber object that initially holds the absolute value of n.
static boolean	divides(MyNumber m0, MyNumber n0) Returns true if m divides n evenly.
static boolean	isNegative(MyNumber n) Returns true if n is negative.
static boolean	isZero(MyNumber n) Returns true if n is zero.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isZero

public static boolean isZero(MyNumber n)

Returns true if n is zero.

Parameters:

n - the number to test

Returns:

true if n is zero; false otherwise

isNegative

public static boolean isNegative(MyNumber n)

Returns true if n is negative.

Parameters:

n - the number to test

Returns:

true if n is less than zero; false otherwise

abs

public static MyNumber abs(MyNumber n)

Returns a new MyNumber object that initially holds the absolute value of n.

[The returned object is guaranteed to be an instance of n's class.]

Parameters:

n - the number whose is magnitude is to be taken

Returns:

a new MyNumber object whose initial value is the magnitude of n

divides

public static boolean divides(MyNumber m0,
                              MyNumber n0)

Returns true if m divides n evenly. When n and m are both positive, this is equivalent to saying that true is returned iff

  n = m + m + m + ... + m + m + m

where m may be repeated zero or more times on the right-hand side.

[For consistency with MyInteger, the divides method's behavior is undefined when m is zero.]

Parameters:

m - the number to divide by

n - the number to divide into

Returns:

true if m divides n evenly; false otherwise