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<div class="title">Using timers to measure execution time </div>  </div>
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<div class="textblock"><p>In this example we are using the Real_Timer class to measure the execution time of a simple program. The Real_Timer class is included in the itmisc library.</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;<a class="code" href="itbase_8h.html" title="Include file for the IT++ base module.">itpp/itbase.h</a>&gt;</span>

<span class="keyword">using namespace </span>itpp;

<span class="comment">//These lines are needed for use of cout and endl</span>
<span class="keyword">using</span> std::cout;
<span class="keyword">using</span> std::endl;

<span class="keywordtype">int</span> main()
{
  <span class="comment">//Declare the scalars used:</span>
  <span class="keywordtype">long</span> i, <a class="code" href="group__matrix__functions.html#ga8b3dcc61484fce58ee4244d5731e18fa" title="Sum of all elements in the vector.">sum</a>, N;

  <span class="comment">//Declare tt as an instance of the timer class:</span>
  <a class="code" href="classitpp_1_1Real__Timer.html" title="A real time timer classMeasures real time.">Real_Timer</a> tt;

  <span class="comment">//Initiate the variables:</span>
  N = 1000000;
  sum = 0;

  <span class="comment">//Start and reset the timer:</span>
  tt.<a class="code" href="classitpp_1_1Timer.html#afeed20347c7ba104cbddb62e76340bc7" title="Resets the timer and starts it.">tic</a>();

  <span class="comment">//Do some processing</span>
  <span class="keywordflow">for</span> (i = 0; i &lt; N; i++) {
    sum += i;
  }

  <span class="comment">// Print the elapsed time</span>
  tt.<a class="code" href="classitpp_1_1Timer.html#adc264ac0276f798f33d229e17c66f8a5" title="Prints the elapsed time since last tic()">toc_print</a>();

  <span class="comment">//Print the result of the processing:</span>
  cout &lt;&lt; <span class="stringliteral">&quot;The sum of all integers from 0 to &quot;</span> &lt;&lt; N - 1 &lt;&lt; <span class="stringliteral">&quot; equals &quot;</span> &lt;&lt; sum &lt;&lt; endl;

  <span class="comment">//Exit program:</span>
  <span class="keywordflow">return</span> 0;

}
</pre></div><p>When you run this program, the output will look something like this:</p>
<div class="fragment"><pre class="fragment">Elapsed time = 0.000797055 seconds
The sum of <a class="code" href="namespaceitpp.html#af8943303111340f2be687512ff112501" title="Returns true if all elements are ones and false otherwise.">all</a> integers from 0 <a class="code" href="group__fixed.html#gab4732503214b5293aef0cbd2ab271c7c">to</a> 999999 equals 1783293664
</pre></div> </div></div>
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