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.. highlight:: cpp
.. _arduino-arithmeticcompound:
Compound Arithmetic Operators (``+=`` , ``-=``, ``*=``, ``/=``)
===============================================================
Description
-----------
Perform a mathematical operation on a variable with another constant
or variable. These operators are just a convenient shorthand::
x += y; // equivalent to the expression x = x + y;
x -= y; // equivalent to the expression x = x - y;
x *= y; // equivalent to the expression x = x * y;
x /= y; // equivalent to the expression x = x / y;
Here is an example::
int x = 2;
int y = 10;
x += 4; // x now contains 6
x -= 3; // x now contains 3
x *= y; // x now contains 30
x /= 2; // x now contains 15
x += max(20, 6); // x now contains 35
x -= sq(5); // x now contains 15
Parameters
----------
**x**: a numeric variable
**y**: a numeric variable, number constant, or any other expression
that evaluates to a number (e.g. call to a function that returns a
number).
See Also
--------
- :ref:`Arithmetic operators <arduino-arithmetic>`
.. include:: cc-attribution.txt
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