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1.30 infinity, infinityf—representation of infinity

Synopsis 

     #include <math.h>
     double infinity(void);
     float infinityf(void);

Description
infinity and infinityf return the special number IEEE infinity in double- and single-precision arithmetic respectively.
Portability
infinity and infinityf are neither standard C nor POSIX. C and POSIX require macros HUGE_VAL and HUGE_VALF to be defined in math.h, which Newlib defines to be infinities corresponding to these archaic infinity() and infinityf() functions in floating-point implementations which do have infinities.