compiler errors - C: Why can't you increment/decrement a variable twice in the same expression? -


when try compile code

int main() {     int = 0;     ++(++i); }

i error message.

test.c:3:5: error: lvalue required increment operand      ++(++i);      ^

what error message saying? gets picked parser, or discovered during semantic analysis?

++i give rvalue1 after evaluation , can't apply ++ on rvalue.

§6.5.3.1 (p1):

the operand of prefix increment or decrement operator shall have atomic, qualified, or unqualified real or pointer type, , shall modifiable lvalue.

1. called "rvalue" in international standard described "value of expression". - §6.3.2.1 footnote 64).


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