title: What's the difference between long long and long
body: <p>What's the difference between long long and long?  And they both don't work with 12 digit numbers (600851475143), am I forgetting something?</p>
  
  <pre><code>#include &lt;iostream&gt;
  using namespace std;
  
  int main(){
    long long a = 600851475143;
  }
  </code></pre>