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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
-------
::
// running is a boolean variable:
bool running = false;
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT);
pinMode(BOARD_BUTTON_PIN, INPUT);
}
void loop() {
if (isButtonPressed()) {
// button is pressed
running = !running; // toggle running variable
digitalWrite(BOARD_LED_PIN, running) // indicate via LED
}
}
See Also
--------
- :ref:`Boolean constants <lang-constants-bool>`
- :ref:`Boolean operators <lang-boolean>`
- :ref:`Variables <lang-variables>`
.. include:: /arduino-cc-attribution.txt
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