From 210f3d2b1555bae87c9de27ea145e16d3bddb0f8 Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Fri, 3 Dec 2010 20:18:00 -0500 Subject: cleaning up previous commits. note that addition of new files under docs/source/lang/api and docs/source/lang/cpp which were just copies of files in docs/source/lang/ imply that change history is lost to git. --- source/lang/booleanvariables.rst | 54 ---------------------------------------- 1 file changed, 54 deletions(-) delete mode 100644 source/lang/booleanvariables.rst (limited to 'source/lang/booleanvariables.rst') diff --git a/source/lang/booleanvariables.rst b/source/lang/booleanvariables.rst deleted file mode 100644 index 6051b8c..0000000 --- a/source/lang/booleanvariables.rst +++ /dev/null @@ -1,54 +0,0 @@ -.. highlight:: cpp - -.. _lang-booleanvariables: - -Booleans -======== - -A **boolean** holds one of two values, :ref:`true -` or :ref:`false `. On a -Maple, each boolean variable has type ``bool``. - -.. warning:: - - On an Arduino, the type ``boolean`` is also provided. While the - Maple also has this type for compatibility, **its use is strongly - discouraged**. The ``bool`` type is a standard part of C++, while - ``boolean`` is a non-standard extension that serves no purpose. - -Example -------- - -:: - - int ledPin = 13; // LED on pin 13 - int switchPin = 12; // momentary switch on 12, other side connected to ground - - // running is a boolean variable: - bool running = false; - - void setup() { - pinMode(ledPin, OUTPUT); - pinMode(switchPin, INPUT); - digitalWrite(switchPin, HIGH); // turn on pullup resistor - } - - void loop() { - if (digitalRead(switchPin) == LOW) { - // switch is pressed - pullup keeps pin high normally - delay(100); // delay to debounce switch - running = !running; // toggle running variable - digitalWrite(ledPin, running) // indicate via LED - } - } - -See also --------- - - -- :ref:`Boolean constants ` -- :ref:`Boolean operators ` -- :ref:`Variables ` - - -.. include:: cc-attribution.txt -- cgit v1.2.3