Ha. Nice work.
On 8/27/21 8:17 PM, Alejandro Colomar (man-pages) wrote:
Hi David,
On 8/28/21 2:01 AM, Alejandro Colomar (man-pages) wrote:
I mean:
!(int)x
(int)!x
The precedence doesn't matter there, as they apply one after the
other, right to left.
So, I'll keep casts in row 2.
Hmm, I just came up with some very stupid piece of code that can show
the different precedence between "unary operators" and "cast operators":
sizeof(int)x;
Which I hope no-one on earth would ever want to be valid C.
If casts had the same precedence as unary operators, this would be:
First, cast x to int, then apply sizeof to the resulting int (since
sizeof can be used without parentheses on non-types).
But since sizeof has greater precedence than the cast, it would be:
First, calculate sizeof(int), then... x? Invalid expression!
And luckily, the second thing happens, and the compiler yells:
sizeof.c: In function ‘foo’:
sizeof.c:3:20: error: expected ‘;’ before ‘x’
3 | return sizeof(int)x;
| ^
| ;
So I think this deserves a new row.
Thanks!
Alex
Cheers,
Alex
--
Have all good days!
David Sletten
