Hi,
> Le 21 sept. 2022 à 23:31, Lukas Arsalan <cptarse-l...@yahoo.com> a écrit :
>
> exp:
> "-" "num" { $$ = -*new Float($2); std::cout << "NUMinv" << $$
> << std::endl; }
> | "num" { $$ = new Float($1); std::cout << "num" << $$ <<
> std::endl; }
> | "-" exp { $$ = -*$2; std::cout << "inv" << $$ << std::endl; }
This snippet is clearly ambiguous, since it allows two different parses of -1,
which -Wcex nicely showed.
If I were you, I would handle this in the scanner. IOW, the scanner should be
extended to support signed literals, and process that initial `-`. So the
grammar would no longer include `exp: "num"`.
Your actions look quite badly typed. And `std::endl` should seldom be used,
`'\n'` is enough.
Cheers!
