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A power of 2 Puzzles for programmers  Weight: 0 Liked the puzzle: 100% 06.01.2010
A positive integer is given. How can you determine whether it is a power of 2 without using recursion and floating point operations?
Comments:   8 check your solution  

Please do not post comments containing clues, hints, or anything that might be considered as a hint to others. All such comments will be deleted. If you have a question, you can contact a moderator by clicking the button "Submit your solution".

idler_
 
Rating: 106
Group: Moderators
2011-01-28 19:42:22
Reserved.
lidSpelunker
 
Rating: 53
Group: Members
2011-02-15 20:02:43
Is iteration permitted?(e.g. for loops, while loops etc.)
alan
 
Rating: 231
Group: Moderators
2011-02-21 00:01:57
lidSpelunker 2011-02-15 20:02:43
Is iteration permitted?(e.g. for loops, while loops etc.)

No.
zzz123
 
Rating: 72
Group: Members
2011-03-20 18:17:47
what operations ARE allowed, exactly?
alan
 
Rating: 231
Group: Moderators
2011-03-21 12:56:31
Any operations of C++, for example. Except loops and function calls.
zzz123
 
Rating: 72
Group: Members
2011-03-23 03:46:05
is this a positive integer in the mathematical sense or the programmer sense? (e.g. is it capped at some number of bits, or is a 6-trillion-digit number considered valid input)
alan
 
Rating: 231
Group: Moderators
2011-03-23 08:28:17
zzz123 2011-03-23 03:46:05
is this a positive integer in the mathematical sense or the programmer sense? (e.g. is it capped at some number of bits, or is a 6-trillion-digit number considered valid input)

You don't know number of bits anyway.
Muzza
 
Rating: 15
Group: Members
2011-03-24 05:19:40
it is very easy to obtain number of bits in C++ without using loops



 
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