In many of the C expressions, white spaces are ignored (example: in case of a**b, where b is a pointer, whitespace is ignored) . But in few cases they cannot be ignored. We get many SO posts on x+++y and related (c++ spaces in operators , what are the rules). I know x+++y really mean (x++) + Y because of higher precedence for postfix. Also there is a difference between x++ +y and x+ ++y. So whitespaces are not always ignored in c expressions. I want to know what is the rule for whitespaces in expressions. Where it is defined? When they are not ignored? Is it when two operators come one after the other especially increment/decrement operators?
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