Re: Floats and %d

[Parke <parke.nexus@...>]

On Tue, Jul 14, 2015 at 5:58 PM, Rena <hyperhacker@gmail.com> wrote:
> This is something I've been stubbing my toe on a lot lately and it's
> rather annoying:
>
> Lua 5.3.1  Copyright (C) 1994-2015 Lua.org, PUC-Rio
> ; print(string.format('%d', 1.1))

> In previous versions - and in C - it would just silently truncate the
> number (drop the fractional part).

In C?  Really?  What compiler?

$ cat test.c
#include <stdio.h>
int main () {
  printf ( "%d\n", 2.3 );
  return 0;
}

$ gcc test.c
test.c: In function ‘main’:
test.c:3:3: warning: format ‘%d’ expects argument of type ‘int’, but
argument 2 has type ‘double’ [-Wformat=]
   printf ( "%d\n", 2.3 );
   ^

$ gcc -Wformat=0 test.c

$ ./a.out
-782778040

-Parke