isinf

isinf

Test for infinite floating-point number

Portability: C99

   #include <math.h>

   int isinf(floating x);

isinf tests whether its argument is a infinite number, that is, plus or minus infinity.

isinf returns zero if its argument is not infinite, and a non-zero value otherwise.

When called from a compilation compiled without the bfp option, isinf always returns zero.

fpclassify, isfinite, isnan, isnormal

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