• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Jeanne Boyarsky
  • Liutauras Vilda
Sheriffs:
  • Rob Spoor
  • Bear Bibeault
  • Tim Cooke
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Piet Souris
Bartenders:
  • Frits Walraven
  • Himai Minh

Maybe a error in Mr Dan's Mock

 
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Topic -> Lang -> Math
Q 14:
Question 14
Which of the following statements are true in terms of the java.lang.Math.abs method?
a. Four overloaded versions of abs exist.
b. An ArithmeticException is declared in the throws clause.
c. The type of the return value depends on the type of the argument.
d. The returned value is always of a floating-point primitive type.
e. If the argument is greater than or equal to zero then the returned value is equal to the argument.
f. If the argument, arg, is less than zero then the returned value is -arg.
g. None of the Above
answer: a c e f
sorry, i don't think F is correct.
say
Math.abs(Interger.MIN_VALUE) == Integer.MIN_VALUE.
 
Keen Chen
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
OH
That is the latest version Dec. 4
Thx a lot for Your hard working for us.
 
Author & Gold Digger
Posts: 7617
6
IntelliJ IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
f is correct. The Java API for Math.abs says:
If the argument is negative, the negation of the argument is returned.
this is exactly what Dan expresses in the option f. If arg is negative, that is, -2 for instance, then -(-2), that is, 2 is returned. Math.abs always returns positive values.
 
Keen Chen
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
oh?
API say that?
ok, Interger.MIN_VALUE, IS IT NEGATIVE?, yes.
Math.abs(Integer.MIN_VALUE) == Integer.MIN_VALUE.
SO , API HAVE ERROR.
 
Ranch Hand
Posts: 279
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Of course API is not wrong at this point. The thing is the case you're presenting is very specific and is an exception. This happens because integers in Java are signed, so the MSB is for the sign of the number.
Integer.MIN_VALUE = 0x8FFFFFFF
 
Keen Chen
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi,Alfred, yes, i konw
and i know why abs(Integer.MIN_VALUE) still equals itself. ,it's a exception.
but, that's not question.
the question which we are talk about is :
is that expression RIGHT?
because the EXCEPTION, reduction to absurdity , the expression is error.
at least, it's not accurate .
That's all
 
Alfred Kemety
Ranch Hand
Posts: 279
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
The sentence stated in option F is true

pritns true
 
Ranch Hand
Posts: 1865
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thank you Alfred.
 
You showed up just in time for the waffles! And this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
reply
    Bookmark Topic Watch Topic
  • New Topic