There are several NaNs, but only a single bit pattern for IEEE754 infinity (modulo the sign bit). So yes, your suggestion should work well. Thank you, I'll give it a try.
On Sat, Jul 27, 2019, 07:44 Adrian Ho <ml+prog-gol...@03s.net> wrote: > On 26/7/19 9:20 PM, Jan Mercl wrote: > > In a program that generates C, I'm using big.Float.Text > > (https://golang.org/pkg/math/big/#Float.Text) to produce the exact > > value of the C floating point literal. As it turns out, the function > > does not support Inf values. Instead of encoding the exact bits of the > > Inf value, the resulting string is simply "Inf". > > > > I'm looking for possibly existing, open source Go code that does the > > conversion properly both for C floats (Go float32) and C doubles (Go > > float64). So far I was not able to find anything. I can surely roll my > > own code, but I'd very much like to use a well tested code if someone > > can point me to such. > > > > TIA > > Section 7.12.4 of the C99 standard says that <math.h> defines the > *INFINITY* macro to represent positive infinity, and the way it's > defined in the standard suggests that negative infinity can be > represented by simply negating that constant. Doing it this way works > portably across all standard C compilers and architectures. > > Is there a reason you can't simply post-process Text() output to replace > "Inf" with "INFINITY"? That's just a simple "if" test. > > -- > Best Regards, > Adrian > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/b6efb830-e465-fe37-8be4-27233e27d60f%4003s.net > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAA40n-XKAQd5euW%2BHLwKR5wDwYnqH8F3%3D4hVic2GTG4VW-TZjg%40mail.gmail.com.
