Minimum and maximum of signed zero

Question

I am concerned about the following cases

min(-0.0,0.0)
max(-0.0,0.0)
minmag(-x,x) 
maxmag(-x,x)

According to Wikipedia IEEE 754-2008 says in

Answer 1

Why not read the standard yourself? The Wikipedia article for IEEE contains links to the standard.

Note: The C standard document is not available freely. But the final draft is (that's what I linked, search to find the pdf version). However, I've not seen the final document being cited here and AFAIK there had mostly been some typos corrected; nothing changed. IEEE is, however, available for free.

Note that a compiler need not stick to the standards (some embedded compilers/versions for instance do not implement IEEE-conforming floating point values, but are still C-conforming - just read the standard for details). So see the compiler documentation to see the compatibility. MS-VC for instance is not even compatible to C99 (and will never ben), while gcc and clang/llvm are (mostly) compatible to C11 in the current versions (gcc since 4.9.2 at least, in parts since 4.7).

In general, when using MS-VC, check if it actually does support that all standard features used. It is actually not fully compliant to the current standard, nor C99.