0">Constants</a></li>
<li><a class="reference internal" href="#true-false-and-null" id="id11">TRUE, FALSE, and NULL</a></li>
<li><a class="reference internal" href="#logical-operators" id="id12">Logical Operators</a></li>
<li><a class="reference internal" href="#comparing-return-values-and-typecasting" id="id13">Comparing Return Values and Typecasting</a></li>
<li><a class="reference internal" href="#debugging-code" id="id14">Debugging Code</a></li>
<li><a class="reference internal" href="#whitespace-in-fil