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authorCraig Jennings <c@cjennings.net>2024-04-07 13:41:34 -0500
committerCraig Jennings <c@cjennings.net>2024-04-07 13:41:34 -0500
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+ <h1 id="firstHeading" class="firstHeading">clock_t</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;time.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">typedef /* unspecified */ clock_t;</pre>
+</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> </table> <p><span class="t-rev-inl t-until-c11"><span>Arithmetic</span><span><span class="t-mark-rev t-until-c11">(until C11)</span></span></span><span class="t-rev-inl t-since-c11"><span>Real</span><span><span class="t-mark-rev t-since-c11">(since C11)</span></span></span> type capable of representing the processor time used by a process. It has implementation-defined range and precision.</p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
+#include &lt;time.h&gt;
+#include &lt;math.h&gt;
+
+volatile double sink;
+int main (void)
+{
+ clock_t start = clock();
+
+ for(size_t i=0; i&lt;3141592; ++i)
+ sink+=sin(i);
+
+ clock_t end = clock();
+ double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
+
+ printf("for loop took %f seconds to execute \n", cpu_time_used);
+}</pre></div> <p>Possible output:</p>
+<div class="text source-text"><pre data-language="c">for loop took 0.271828 seconds to execute</pre></div> </div> <h3 id="References"> References</h3> <ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul><li> 7.27.1/3 Components of time (p: 284) </li></ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.27.1/3 Components of time (p: 388) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.23.1/3 Components of time (p: 338) </li></ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.12.1 Components of time </li></ul>
+</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="clock" title="c/chrono/clock"> <span class="t-lines"><span>clock</span></span></a></div> </td> <td> returns raw processor clock time since the program is started <br> <span class="t-mark">(function)</span> </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="clocks_per_sec" title="c/chrono/CLOCKS PER SEC"> <span class="t-lines"><span>CLOCKS_PER_SEC</span></span></a></div> </td> <td> number of processor clock ticks per second <br> <span class="t-mark">(macro constant)</span> </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/chrono/c/clock_t" title="cpp/chrono/c/clock t">C++ documentation</a></span> for <code>clock_t</code> </td>
+</tr> </table> <div class="_attribution">
+ <p class="_attribution-p">
+ &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
+ <a href="https://en.cppreference.com/w/c/chrono/clock_t" class="_attribution-link">https://en.cppreference.com/w/c/chrono/clock_t</a>
+ </p>
+</div>