1 files changed, 43 insertions, 0 deletions
diff --git a/docs/source/lang/cpp/compoundarithmetic.rst b/docs/source/lang/cpp/compoundarithmetic.rst
new file mode 100644
index 0000000..d70a43c
--- /dev/null
+++ b/docs/source/lang/cpp/compoundarithmetic.rst
@@ -0,0 +1,43 @@
+.. highlight:: cpp
+
+.. _lang-compoundarithmetic:
+
+Compound Arithmetic Operators (``+=`` , ``-=``, ``*=``, ``/=``)
+===============================================================
+
+These oparators 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 <lang-arithmetic>`
+
+.. include:: /arduino-cc-attribution.txt