Re: [Mingw-users] Floating point woes...

[Greg C. <gch...@sb...>]

On 2013-02-18 08:26Z, Daniel Carrion wrote:
> 
> The issue was the REAL program outputs to 3 decimal places. I.e. I was
> getting rounding of 1.890 instead of 1.889. As mentioned, I don't get this
> issue when using MinGW 4.7.2. There was obviously something going on with
> my 4.6 version I was using previously.

For the floating constant in your original test case:
  snprintf(buf,17,"%.17f",1.8895);
the C standard [6.4.4.2/3] allows the compiler to choose a value
either slightly higher, or slightly lower, than the unrepresentable
exact value. This value can round either to 1.890 or to 1.889 .