Re: POSIX and float rounding

[Guy Harris <gharris () sonic net>]

On Mar 19, 2026, at 9:16 AM, Guy Harris <gharris () sonic net> wrote:

> On Mar 19, 2026, at 6:40 AM, Denis Ovsienko <denis () ovsienko info> wrote:
>
> > Does POSIX define which method printf(3) is supposed to use for
> > rounding a float?
>
> The first question to ask is "does *the C standard* define which method printf() is supposed to use for rounding a 
> float?"

As for POSIX, it says "The functionality described on this reference page is aligned with the ISO C standard. Any 
conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 
1003.1-2001 defers to the ISO C standard." in a number of places, including <fenv.h>, fegetround(), fesetround(), and 
fprintf().
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