title: What is the meaning of const keyword ?
body: <p>What does it mean that a constant is protecting a variable that have 
  been passed to a function via pointer?</p>
  
  <p>For example : </p>
  
  <pre><code>int f ( const int vec[]);
  </code></pre>
  
  <p>The following command is not legal:</p>
  
  <pre><code>vec[i] = exp;
  </code></pre>