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Actually, the order in which function arguments are evaluated is undefined. http://c-faq.com/expr/comma.html

You can use a comma in other expressions to introduce a sequence point: http://c-faq.com/~scs/cgi-bin/faqcat.cgi?sec=expr#seqpoints




Thanks for your clever comment and for those emitting similar concerns.

You surely are right. I wanted to give a quick example, turns out it was a bad one. Next time I'll write :

  int i = 0;
  printf("%i", i++); // prints 0
  printf("%i", ++i); // prints 2


turns out it was a bad one

Given that you were making a point on an article about the complexity of C, I'd say it was an unintentionally excellent example.


If you really want to make your brain hurt, there was an article on HN a while ago about the following statement:

    i = i++;
Evaluating that expression takes a real dive into the guts of the C spec.




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