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author | Marti Bolivar <mbolivar@mit.edu> | 2010-11-28 11:23:33 -0500 |
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committer | Marti Bolivar <mbolivar@mit.edu> | 2010-11-28 11:23:33 -0500 |
commit | 5e587be27a7c3bd854b686952a5c9637a2432ff0 (patch) | |
tree | 09d4ceeb46f19287ee874a24516c68be90c9ad8e /docs/source/arduino/int.rst | |
parent | db4ff6ba53e9b702c77411ae19cd53d914a675de (diff) | |
download | librambutan-5e587be27a7c3bd854b686952a5c9637a2432ff0.tar.gz librambutan-5e587be27a7c3bd854b686952a5c9637a2432ff0.zip |
reorganized all the arduino/ docs into a lang/ subdirectory since
they're properly CC attributed now.
Diffstat (limited to 'docs/source/arduino/int.rst')
-rw-r--r-- | docs/source/arduino/int.rst | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/docs/source/arduino/int.rst b/docs/source/arduino/int.rst deleted file mode 100644 index 690deb8..0000000 --- a/docs/source/arduino/int.rst +++ /dev/null @@ -1,70 +0,0 @@ -.. highlight:: cpp - -.. _arduino-int: - -int -=== - -Description ------------ - -The ``int`` data type represents integers. Integers are your primary -data type for number storage, and store a 4 byte value. This yields a -range of -2,147,483,648 to 2,147,483,647 (minimum value of -2^31 and a -maximum value of (2^31) - 1; that's about negative 2 billion to -positive 2 billion). - -An ``int`` stores a negative number with a technique called `two's -complement math -<http://en.wikipedia.org/wiki/Two%27s_complement#Explanation>`_\ . -The highest bit in an ``int``, sometimes refered to as the "sign" bit, -flags the number as a negative number. (See the linked article on -two's complement for more information). - -The Maple takes care of dealing with negative numbers for you, so that -arithmetic operations work mostly as you'd expect. There can be an -:ref:`unexpected complication <arduino-bitshift-signbit-gotcha>` in -dealing with the :ref:`bitshift right operator (>>) -<arduino-bitshift>`, however. - -Here is an example of declaring an ``int`` variable named ``ledPin``, -then giving it value 13:: - - int ledPin = 13; - -The general syntax for declaring an ``int`` variable named ``var``, -then giving it value ``val``, looks like:: - - int var = val; - -.. _arduino-int-overflow: - -Integer Overflow ----------------- - -When ``int`` variables leave the range specified above, they "roll -over" in the other direction. It's like in the game *Pac-Man* -- when -Pac-Man goes past the right edge of the screen, he reappears on the -left, and when he goes past the left side of the screen, he reappears -on the right. Here are some examples:: - - int x; - x = -2,147,483,648; - x--; // x now contains 2,147,483,647; rolled over "left to right" - - x = 2,147,483,647; - x++; // x now contains -2,147,483,648; rolled over "right to left" - -See Also --------- - -- :ref:`unsigned int <arduino-unsignedint>` -- :ref:`char <arduino-char>` -- :ref:`unsigned char <arduino-unsignedchar>` -- :ref:`long <arduino-long>` -- :ref:`unsigned long <arduino-unsignedlong>` -- :ref:`Integer Constants <arduino-constants-integers>` -- :ref:`Variables <arduino-variables>` - - -.. include:: cc-attribution.txt
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