isnormal

isnormal

Test for normal floating-point number

Portability: C99

   #include <math.h>

   int isnormal(floating x);

isnormal tests whether its argument is a normal floating-point number, that is, not zero, not infinite, not denormalized, and not a NaN.

isnormal returns zero if its argument is a normal floating-point number, and a non-zero value otherwise.

When called from a compilation compiled without the bfp option, isnormal always returns zero for a zero argument and non-zero otherwise.

fpclassify, isfinite, isinf, isnan

"Mathematical Functions" in Chapter 2, "Function Categories"