isfinite

isfinite

Test for finite floating-point number

Portability: C99

   #include <math.h>

   int isfinite(floating x);

isfinite tests whether its argument is a finite number, that is, not infinite, and not a NaN.

isfinite returns zero if its argument is not finite, and a non-zero value otherwise.

When called from a compilation compiled without the bfp option, isfinite always returns non-zero.

fpclassify, isinf, isnan, isnormal

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