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here is nice post on this question
campuscoke.blogspot.in/2014/12/explain-n-n-1-0.html

No! This code reveals whether the integer is a Power of 2.

Suppose you have the following...

1st case(positive integer):
8=01000 <= n
7=00111 <= n-1

So 8 & 7 = 0000 = 0

2nd case(0):
0=0000
-1=1111

So 0& (-1)=0000=0

3rd case(neg):
-2^31= 100...0

Boundary check #2:
-1: 111...111
-2: 111...110

2^31-1=0111...111
2^31-2=0111...110

This code reveals if n is -2^31 or ^2^31-1. In english, is it the smallest/greatest integer.

What Khoa said makes sense. If you think of it this way, when you substract 1 from n, it'll read right to left, changing every zero to a 1 and stopping once it hits a 1.

If n&(n-1) equals zero, then it must've inverted n's left most '1', which means that everything before that must been a 0. That means that n is in the form 1000.., making it a power of two.

Ok. That makes a lot of sense.

yes

In other words, it says whether the number in binary representation has more than one binary digit '1'...

This is the answer to one of most annoying programming questions asked from C/C++ programmers. Give a 1 line way with no loops to determine whether an integer is a power of 2 :)

There's one number that this test fails for finding out if n is a power of two. It fails when n = 0.

but 0 is not a power or 2... so no worries

@slickwickynicky, ur name says that u r a gr8 asshole....so plz dont comment when u dont know anything...ok..kick ur asssss

gunner: 0 is not a power of two so the fact that this statement returns true for n=0 means it fails in that case

(0 & n) == 0 for all n

'

and 1=

' and 1=

\'

'''

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1 OR 1=1

1' OR '1'='1

1'1

' 1 AND 1=1

1 AND 1=1

1\'1

) or ('1'='1--

' or 1=1/*

' or 1=1--

order by 1000/*

order by 1000;--

' order by 1000/*

' order by 1000;--

' or 1=1--

" or 1=1--

') or ('a'='a

It simply resets the lowest bit that is set. Say n was 0111, it resets lowest bit and resultant will be 0110. This expression is typically used to count number of bits set in a value

It simply resets the lowest bit that is set. Say n was 0111, it resets lowest bit and resultant will be 0110. This expression is typically used to count number of bits set in a value

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January 25 - 31 ~ Lion
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February 01 - 05 ~ Cat
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March 13 - 15 ~ Lion
March 16 - 23 ~ Mouse
March 24 - 31 ~ Cat
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April 01 - 03 ~ Dog
April 04 - 14 ~ Panther
April 15 - 26 ~ Mouse
April 27 - 30 ~ Turtle
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May 01 - 13 ~ Monkey
May 14 - 21 ~ Dove
May 22 - 31 ~ Lion
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June 01 - 03 ~ Mouse
June 04 - 14 ~ Turtle
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June 21 - 24 ~ Monkey
June 25 - 30 ~ Cat
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July 01 - 09 ~ Mouse
July 10 - 15 ~ Dog
July 16 - 26 ~ Dove
July 27 - 31 ~ Cat
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August 01 - 15 ~ Lion
August 16 - 25 ~ Mouse
August 26 - 31 ~ Turtle
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September 01 - 14 ~ Dove
September 15 - 27 ~ Cat
September 28 - 30 ~ Dog
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October 01 - 15 ~ Monkey
October 16 - 27 ~ Turtle
October 28 - 31 ~ Panther
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November 17 - 30 ~ Cat
*
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