Win a copy of The Java Performance Companion this week in the Performance forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

Math.random

 
yashendrakar chandrakar
Greenhorn
Posts: 15
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
following is the question taken from CompleteJava2Certification(by Robert-Heler)
_________________________________________________________________Question:
What is the value of the following expression?

Math.round(Math.random() + 2.50001);
Options:
A)2
B)3
C)can't say.
_________________________________________________________________
According to book
----------------
Correct selection is: B
Math.random() returns a double greater than or equal to 0.0 and less than 1.0. Math.random() + 2.50001 is a double greater than 2.5 and less than 3.5. Math.round() of any number between but not including 2.5 and 3.5 is 3.

But if i m not wrong
-------------------
suppose Math.random() return .99999 then
Math.round(Math.random() + 2.50001);
will be evaluated to
Math.round(.99999 + 2.50001);
or
Math.round(3.5);//it will return 4

so correct selection should be: C)

 
Vikrama Sanjeeva
Ranch Hand
Posts: 760
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I AM WITH U....
Bye.
Viki.
------------------
Count the flowers of ur garden,NOT the leafs which falls away!
 
Cristian Negresco
Ranch Hand
Posts: 182
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,
you are right, consult the errata of the bock.
..Cristian
 
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic