spir wrote:
Le Tue, 27 Jan 2009 11:26:06 -0200,
Ricardo Aráoz <ricar...@gmail.com> a écrit :
Operation Result Notes
|x | y| bitwise /or/ of x and y
|x ^ y| bitwise /exclusive or/ of x and y
|x & y| bitwise /and/ of x and y
|x << n| x shifted left by n bits (1), (2)
|x >> n| x shifted right by n bits (1), (3)
|~x| the bits of x inverted
Why not '!' for not, instead of '~'? I mean, '!' is used in logic, in many
languages and even in python (!=). On the other hand, I had never encountered
'~' meaning not.
Watch out here, the above operations work on integer values, not on single
bits. In that context, 'not' and '~' are two different operations.
'not v' inverts the logical value of v (that is, it computes 'not (v != 0)').
'~v' on the other hand, swaps all bits of the integer value.
print ~1 # gives '-2' as result
print not 1 # gives 'False' as result
Sincerely,
Albert
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