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authorMarti Bolivar <mbolivar@mit.edu>2010-12-21 10:27:37 -0500
committerMarti Bolivar <mbolivar@mit.edu>2010-12-21 10:27:37 -0500
commitc45bccad44187da27505cf5808424e709e3f54a1 (patch)
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Merge branch 'master' into debug-serialusb.
Chose debug-serialusb version in cases of conflict. Conflicts: libmaple/usb/usb_callbacks.c
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-.. _arduino-bitwisexornot:
-
-Bitwise NOT (~)
-===============
-
-The bitwise NOT operator in C++ is the tilde character ~. Unlike &
-and \|, the bitwise NOT operator is applied to a single operand to
-its right. Bitwise NOT changes each bit to its opposite: 0 becomes
-1, and 1 becomes 0. For example:
-
-
-
-::
-
- 0 1 operand1
-
-
-
-::
-
- ----------
- 1 0 ~ operand1
-
-
-
-::
-
- int a = 103; // binary: 0000000001100111
- int b = ~a; // binary: 1111111110011000 = -104
-
-
-
-You might be surprised to see a negative number like -104 as the
-result of this operation. This is because the highest bit in an int
-variable is the so-called sign bit. If the highest bit is 1, the
-number is interpreted as negative. This encoding of positive and
-negative numbers is referred to as two's complement. For more
-information, see the Wikipedia article on
-`two's complement. <http://en.wikipedia.org/wiki/Twos_complement>`_
-
-
-
-As an aside, it is interesting to note that for any integer x, ~x
-is the same as -x-1.
-
-
-
-At times, the sign bit in a signed integer expression can cause
-some unwanted surprises.
-
-