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Give a one-line C expression to test whether a number is a power of 2.
[No loops allowed]

ravi wrote:
> Give a one-line C expression to test whether a number is a power of 2.
> [No loops allowed]
>
No, and why are you giving orders?

ravi wrote:

> Give a one-line C expression to test whether a number is a power of 2.
> [No loops allowed]

Do your own homework.



Brian

ravi wrote:
>
> Give a one-line C expression to test whether a number is a power
> of 2. [No loops allowed]

For unsigned integers:

if (!((n - 1) & n)) puts("n is power of 2");

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On Jul 8, 10:22 am, Martin Ambuhl <mamb...@earthlink.net> wrote:
> ravi wrote:
> > Give a one-line C expression to test whether a number is a power of 2.
> > [No loops allowed]
>
> No, and why are you giving orders?

Beacuse I am your father

ravi wrote:

> Give a one-line C expression to test whether a number is a power of 2.
> [No loops allowed]

static inline int
is_power_of_2 (int x)
{
return ((x & (x - 1)) == 0) ;
}


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Erik de Castro Lopo
-----------------------------------------------------------------
"Hamas: Islam will conquer US and Britain."
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Erik de Castro Lopo said:

> ravi wrote:
>
>> Give a one-line C expression to test whether a number is a power of
>> 2.
>> [No loops allowed]
>
> static inline int
> is_power_of_2 (int x)
> {
> return ((x & (x - 1)) == 0) ;
> }

Having proved willing to do homework for free, you and Chuck might want
to brace yourselves for the rush.

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ravi wrote:

> On Jul 8, 10:22 am, Martin Ambuhl <mamb...@earthlink.net> wrote:
> > ravi wrote:
> > > Give a one-line C expression to test whether a number is a power of 2.
> > > [No loops allowed]
> >
> > No, and why are you giving orders?
>
> Beacuse I am your father

Most participants of this group an, (not unreasonable), expectation of
people who post homework questions to have at least made an honest
attempt at the problem. This group hosts, perhaps, the best minds in C
you're likely to meet, but you, (as a new participant and a learner),
need to show willingness to put in some effort on your part, (like
trying to remain civil), to get the best response and help. At least
that been my experience in my participation in this group.

On Sun, 08 Jul 2007 17:23:03 +1000, Erik de Castro Lopo wrote:

> ravi wrote:
>
>> Give a one-line C expression to test whether a number is a power of 2.
>> [No loops allowed]
>
> static inline int
> is_power_of_2 (int x)
> {
> return ((x & (x - 1)) == 0) ;
What if x <= 0 (in which case x cannot be a power of two)?
> }

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Army1987 (Replace "NOSPAM" with "email")
"Never attribute to malice that which can be adequately explained
by stupidity." -- R. J. Hanlon (?)

ravi wrote:
>
> On Jul 8, 10:22 am, Martin Ambuhl <mamb...@earthlink.net> wrote:
> > ravi wrote:
> > > Give a one-line C expression
> > > to test whether a number is a power of 2.
> > > [No loops allowed]
> >
> > No, and why are you giving orders?
>
> Beacuse I am your father

http://www.dockingbay101.com/sounds/...ep5/father.wav

--
pete