On Oct 23, 2009, at 8:50 AM, Jens Alfke wrote:
On Oct 23, 2009, at 8:46 AM, Jens Alfke wrote:
"%f" is for float. Use "%d" for doubles.
Oops, I meant "%lf" for doubles.
%f and %lf both work for both float and double.
The printf(3) man page notes:
Modifier a, A, e, E, f, F, g, G
l (ell) double (ignored, same behavior as without it)
Why? When you pass a float to a `...` function like printf(), the C
language says that it gets converted ("promoted") to a double first.
So printf() always sees a double even if you passed a float. (Small
integer types like char and short are similarly promoted to int, but
in that case the size modifier matters when the type is signed and the
value is negative.)
--
Greg Parker [email protected] Runtime Wrangler
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