title: Sizeof const char* wrong value
body: <pre><code>NSString *lang = @"en";    
  const char* ar = [lang UTF8String];
  int size_of_array = (sizeof ar) / (sizeof ar[0]);
  </code></pre>
  
  <p><code>size_of_array</code> is equal to <code>4</code> and <code>(sizeof ar) = 4</code> and <code>sizeof ar[0] = 1</code>.
  Why? I think it (<code>size_of_array</code>) has to be <code>2</code>.</p>