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<a name="assert_002d_002d_002dmacro-for-debugging-diagnostics"></a>
<h3 class="section">2.5 <code>assert</code>&mdash;macro for debugging diagnostics</h3>
<a name="index-assert"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;assert.h&gt;
void assert(int <var>expression</var>);

</pre></div>
<p><strong>Description</strong><br>
Use this macro to embed debuggging diagnostic statements in
your programs.  The argument <var>expression</var> should be an
expression which evaluates to true (nonzero) when your program
is working as you intended.
</p>
<p>When <var>expression</var> evaluates to false (zero), <code>assert</code>
calls <code>abort</code>, after first printing a message showing what
failed and where:
</p>
<div class="smallexample">
<pre class="smallexample"> Assertion failed: <var>expression</var>, file <var>filename</var>, line <var>lineno</var>, function: <var>func</var>
</pre></div>

<p>If the name of the current function is not known (for example,
when using a C89 compiler that does not understand __func__),
the function location is omitted.
</p>
<p>The macro is defined to permit you to turn off all uses of
<code>assert</code> at compile time by defining <code>NDEBUG</code> as a
preprocessor variable.   If you do this, the <code>assert</code> macro
expands to
</p>
<div class="smallexample">
<pre class="smallexample"> (void(0))
</pre></div>

<br>
<p><strong>Returns</strong><br>
<code>assert</code> does not return a value.
</p>
<br>
<p><strong>Portability</strong><br>
The <code>assert</code> macro is required by ANSI, as is the behavior
when <code>NDEBUG</code> is defined.
</p>
<p>Supporting OS subroutines required (only if enabled): <code>close</code>, <code>fstat</code>,
<code>getpid</code>, <code>isatty</code>, <code>kill</code>, <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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