From 95783b750fda95f5f4c1fac00ab24da03b31b517 Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Mon, 25 Oct 2010 21:15:28 -0400 Subject: arduino language reference nearing completion, properly CC-BY-SA 3.0 attributed --- docs/source/arduino/bitwisexornot.rst | 51 ----------------------------------- 1 file changed, 51 deletions(-) delete mode 100644 docs/source/arduino/bitwisexornot.rst (limited to 'docs/source/arduino/bitwisexornot.rst') diff --git a/docs/source/arduino/bitwisexornot.rst b/docs/source/arduino/bitwisexornot.rst deleted file mode 100644 index 25389cb..0000000 --- a/docs/source/arduino/bitwisexornot.rst +++ /dev/null @@ -1,51 +0,0 @@ -.. _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. `_ - - - -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. - - -- cgit v1.2.3