reorganized all the arduino/ docs into a lang/ subdirectory since

they're properly CC attributed now.

1 files changed, 54 insertions, 0 deletions

diff --git a/source/lang/else.rst b/source/lang/else.rst
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+.. highlight:: cpp
+
+.. _lang-else:
+
+if/else
+=======
+
+``if``/\ ``else`` allows greater control over the flow of code than
+the basic :ref:`if <lang-if>` statement, by allowing multiple tests
+to be grouped together. For example, an :ref:`analog input
+<lang-analogread>` could be tested, with 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 precede 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.  Here is a code example::
+
+    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 a
+:ref:`switch/case <lang-switchcase>` statement.
+
+See Also
+--------
+
+- :ref:`if <lang-if>`
+- :ref:`switch/case <lang-switchcase>`
+
+
+.. include:: cc-attribution.txt