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Amazon Interview Question for Software Engineer / Developers


More Questions from This Interview



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1
of 1 vote

return n&(n-1)==0;

- Anonymous February 04, 2010 | Flag Reply
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0
of 0 votes

ur soln. does not work for number 6.

- Anonymous February 06, 2010 | Flag
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0
of 0 votes

this solution works perfectly. n&(n-1) sets the LSB to 0.
By checking n&(n-1)==0, you are checking there is only 1 bit turned ON which is the condition for power of 2.
thanks

- e=mc2 March 10, 2010 | Flag
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0
of 0 votes

nice soln

- neo February 14, 2011 | Flag
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0
of 0 votes

Elegant! Bravo!

- mathytime September 22, 2014 | Flag
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0
of 0 vote

well, i dont think so that 6 is a power of 2!

- guest727289 February 08, 2010 | Flag Reply
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0
of 0 vote

The first solution perfectly works. 6 & 5 == 4 != 0 hence false. so 6 is not a power of 2.

- Ranga February 26, 2010 | Flag Reply
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0
of 0 vote

This assumes that n=0 is considered a power of 2.

- Anonymous April 09, 2012 | Flag Reply
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0
of 0 vote

if (num & 1) != num it is a power of 2

- limca500ml January 25, 2013 | Flag Reply


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