Simple parsing question [duplicate]

This question already has answers here: Closed 1开发者_StackOverflow2 years ago.

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Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc…)

Undefined Behavior and Sequence Points (C++ FAQ entry)

In C and C++ how is the expression x+++++y parsed? As x++ ++ +y or as x++ + ++y ?

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x+++++y is parsed as x ++ ++ + y and not as x ++ + ++ y. According to Maximal Munch principle "the tokenizer should keep reading characters from the source file until adding one more character causes the current token to stop making sense"

x++ ++ +y should not compile(In C and C++) because the post-increment operator ++ requires an lvalue as an argument and returns an rvalue.