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<a name="clock_002d_002d_002dcumulative-processor-time"></a>
<h3 class="section">8.2 <code>clock</code>—cumulative processor time</h3>
<a name="index-clock"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <time.h>
clock_t clock(void);
</pre></div>
<p><strong>Description</strong><br>
Calculates the best available approximation of the cumulative amount
of time used by your program since it started. To convert the result
into seconds, divide by the macro <code>CLOCKS_PER_SEC</code>.
</p>
<br>
<p><strong>Returns</strong><br>
The amount of processor time used so far by your program, in units
defined by the machine-dependent macro <code>CLOCKS_PER_SEC</code>. If no
measurement is available, the result is (clock_t)<code>-1</code>.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>clock</code> and <code>CLOCKS_PER_SEC</code>.
</p>
<p>Supporting OS subroutine required: <code>times</code>.
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