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+.. _arduino-else:
+
+if / else
+=========
+
+**if/else** allows greater control over the flow of code than the
+basic **if** statement, by allowing multiple tests to be grouped
+together. For example, an analog input could be tested and one
+action taken if the input was less than 500, and another action
+taken if the input was 500 or greater. The code would look like
+this:
+
+
+
+::
+
+    if (pinFiveInput < 500)
+    {
+      // action A
+    }
+    else
+    {
+      // action B
+    }
+
+
+
+**else** can proceed another **if** test, so that multiple,
+mutually exclusive tests can be run at the same time.
+
+
+
+Each test will proceed to the next one until a true test is
+encountered. When a true test is found, its associated block of
+code is run, and the program then skips to the line following the
+entire if/else construction. If no test proves to be true, the
+default **else** block is executed, if one is present, and sets the
+default behavior.
+
+
+
+Note that an **else if** block may be used with or without a
+terminating **else** block and vice versa. An unlimited number of
+such **else if** branches is allowed.
+
+
+
+::
+
+    if (pinFiveInput < 500)
+    {
+      // do Thing A
+    }
+    else if (pinFiveInput >= 1000)
+    {
+      // do Thing B
+    }
+    else
+    {
+      // do Thing C
+    }
+
+Another way to express branching, mutually exclusive tests, is with
+the `switch case <http://arduino.cc/en/Reference/SwitchCase>`_
+statement.
+
+
+
+See also:
+---------
+
+`switch case <http://arduino.cc/en/Reference/SwitchCase>`_
+