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.. highlight:: cpp
.. _lang-max:
max()
=====
(Macro) Calculates the maximum of two numbers.
Syntax
------
::
max(x, y)
Parameters
----------
**x**: the first number; may be any number or numeric expression.
**y**: the second number; may be any number or numeric expression.
Returns
-------
The larger of the two parameter values.
Example
-------
::
sensVal = max(senVal, 20); // assigns sensVal to the larger of sensVal or 20
// (effectively ensuring that it is at least 20)
.. note:: Perhaps counter-intuitively, max() is often used to
constrain the lower end of a variable's range, while :ref:`min()
<lang-min>` is used to constrain the upper end of the range.
Warning
-------
Because of the way ``max()`` is implemented, avoid using other
functions inside the parentheses. It may lead to incorrect results::
max(a--, 0); // avoid this - yields incorrect results
a--; // use this instead -
max(a, 0); // keep other operations outside max()
Arduino Compatibility
---------------------
The Maple implementation of ``max()`` is compatible with Arduino.
See Also
--------
- :ref:`min() <lang-min>`
- :ref:`constrain() <lang-constrain>`
.. include:: /arduino-cc-attribution.txt
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