title: How does qFuzzyCompare work in Qt
body: <p>What is the difference between:</p>
  
  <pre><code>if( a == b )
  </code></pre>
  
  <p>and</p>
  
  <pre><code>if( qFuzzyCompare(a, b) )
  </code></pre>
  
  <p>given that the variables a and b are:</p>
  
  <pre><code>a = 1234.5678
  b = 1234.5678
  </code></pre>
  
  <p>Note: I'm asking because I am having trouble comparing doubles in Qt and I want to understand how <code>qFuzzyCompare</code> works.</p>