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diff --git a/docs/source/lang/cpp/assignment.rst b/docs/source/lang/cpp/assignment.rst new file mode 100644 index 0000000..f9430b4 --- /dev/null +++ b/docs/source/lang/cpp/assignment.rst @@ -0,0 +1,60 @@ +.. highlight:: cpp + +.. _lang-assignment: + +Assignment Operator (``=``) +=========================== + +Stores the value to the right of the equal sign in the variable to +the left of the equal sign. + +The single equal sign in the C++ programming language is called the +assignment operator. It has a different meaning than in algebra +class, where it indicated an equation or equality. The assignment +operator tells the microcontroller to evaluate whatever value or +expression is on the right side of the equal sign, and store it in +the variable to the left of the equal sign [#fgross]_. + +Example +------- + +:: + + int sensVal; // declare an integer variable named sensVal + sensVal = analogRead(0); // store the (digitized) input voltage at analog pin 0 in sensVal + +Programming Tips +---------------- + +The variable on the left side of the assignment operator (``=`` sign) +needs to be able to hold the value stored in it. If it is not large +enough to hold a value, the value stored in the variable will be +incorrect. + +Don't confuse the assignment operator ``=`` (single equal sign) with +the comparison operator ``==`` (double equal signs), which evaluates +whether two expressions are equal. + +Arduino Compatibility +--------------------- + +Assignments on the Maple are identical to those on Arduino. + +See Also +-------- + +- :ref:`if <lang-if>` +- :ref:`char <lang-char>` +- :ref:`int <lang-int>` +- :ref:`long long <lang-longlong>` + +.. rubric:: Footnotes + +.. [#fgross] Experienced C++ programmers know this to be an + oversimplification of what happens when the variable on the left + hand side is an object. See Richard Gillam's wonderful and scary + `The Anatomy of the Assignment Operator + <http://icu-project.org/docs/papers/cpp_report/the_anatomy_of_the_assignment_operator.html>`_ + for more information. + +.. include:: cc-attribution.txt |