title: unsigned long long vs unsigned long(portability point of view)
body: <p>I want to be able to use large positive integers(8 bytes) in my project, even though sizeof(unsigned long) yields 8 in my system, I read that in most systems unsigned long is only 4 bytes and I decided to give unsigned long long a go, since it's guaranteed to be at least 8 bytes. </p>
  
  <p>The more I use it though, I saw that it is not super portable as well, for instance in some systems(depending on the compiler) printf formats it with %llu, in some it formats it with %lld. </p>
  
  <p>My code will only run in 64 bit debian machines, in which unsigned long will be 8 bytes. Portability is not a big issue. Is it an overkill to use unsigned long long over unsigned long under these circumstances, are there any other benefits of using unsigned long long over unsigned long?</p>