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-.. highlight:: cpp
-
-.. _lang-booleanvariables:
-
-Booleans
-========
-
-A **boolean** holds one of two values, :ref:`true
-<lang-constants-true>` or :ref:`false <lang-constants-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 <lang-constants-bool>`
-- :ref:`Boolean operators <lang-boolean>`
-- :ref:`Variables <lang-variables>`
-
-
-.. include:: cc-attribution.txt