title: Comparing long long with 0
body: <pre><code>long long llIdx = foo();
  if (llIdx &gt; 0LL) // Can I use 0 here?
    ...
  </code></pre>
  
  <p>Is there any problem if I use <code>0</code> instead of <code>0LL</code> in above code?</p>
  
  <p>When should I prefer <code>0LL</code> over <code>0</code>?</p>