title: how to check if an array position exist?
body: <pre><code>char X[3];
  </code></pre>
  
  <p>how to check if array <code>X[position]</code> exist?
  for example: </p>
  
  <pre><code>if (x[4] == True)
      printf("Exists")
  else 
     printf("NONE")
  </code></pre>