title: How does this expression work: Num*rand() / RAND_MAX?
body: <p>How does this expression work?</p>
  
  <pre><code> Num*rand() / RAND_MAX
  </code></pre>
  
  <p>If, for example, I replace the number with <code>7.7</code>, it gives me values from <code>0.</code> to <code>7.</code> (<code>double</code>).  </p>