title: What is "fabs" in Objective C?
body: <p>Found this bit of code...</p>
  
  <pre><code>if(fabs([tempPlacemark getCoordinate].latitude-latitude) &lt; latDelta &amp;&amp; fabs([tempPlacemark getCoordinate].longitude-longitude)&lt;longDelta )
  ...
  </code></pre>
  
  <p>refers to this in Math.h:</p>
  
  <pre><code>extern float fabsf(float);
  extern double fabs(double);
  extern long double fabsl(long double);
  </code></pre>
  
  <p>So what am I looking at?</p>