[Bug c++/110749] wrong show float

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110749

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> You don't need to handle the -'- sign yourself:

Oops, I mean '-' sign.