title: Add constant to array
body: <p>I have this code:</p>
  
  <pre><code>const int a = 2;
  
  const int arr[] = {
    1,a,3,4
  };
  </code></pre>
  
  <p>But it gives me this error:</p>
  
  <blockquote>
    <p>source.c:6:3: error: initializer element is not constant</p>
  </blockquote>
  
  <p>How can I add a constant to an array?</p>