wrappers

[Rajani Sudhakar]

Which of the following statements is false ?

Options :

a . Math . min ( -0f , 0f ) == 0f
b . Math . round ( Long . MAX_VALUE + 1.5) == Long . MAX_VALUE
c . Math . round ( Integer . MIN_VALUE - 6.5 ) == Integer . MIN_VALUE
d . Math . round ( Integer . MIN_VALUE - 6.5f ) == Integer . MIN_VALUE

Answer : c

can anyone tell me why c returns false... and why others return true?

Thanks in advance..

rajani.

[Ab Sharma]

Rajani,

By default 6.5 is taken as double rathe than float. and Math.round has only two signatures:

static long round(double a)
static int round(float a)

So C should be the correct answer as the return value should be long.

Hopre that clarifies..
Abhishek

[Jack Lau]

Hello All,

But I do not know why Math.min(-0f, 0f) == 0f is true ?

Thanks,
Jack

[Marc Gr]

This is the right answer. Check out the last senence out of the Java API in the paragraph below

"If one argument is positive zero and the other is negative zero, the result is negative zero."

BUT...

positive and negative zero are considered equal therefore
-0.0 < 0.0 is false and -0.0 <= 0.0 is true

So that is why (A) is true.

(C) is false as described above, becuase round only returns int and long and 6.5 would be converted to double which would convert Integer.MIN_VALUE to double which would return a long, not an int so Integer.MIN_VALUE would not be returned.

Whew... Hope that helps.

[Rajani Sudhakar]

Hi all...

Thankyou soo much for each of your replies.
I am satisfied.

Regards,
rajani.