Thanks for correcting me sjolsen. You are right, the behavior is unspecified only. I added a StackOverflow question (http://stackoverflow.com/questions/2881693

Thanks for correcting me sjolsen. You are right, the behavior is unspecified only. I added a StackOverflow question (http://stackoverflow.com/questions/28816936/is-the-value-of-expression-f-g-when-f-g-modify-same-global-variable-und http://stackoverflow.com/questions/28816936/is-the-value-of-...) to increase the chances of someone being able to find (hopefully authoritative) information when searching for it.