fpclassify

fpclassify

Classify floating-point number

Portability: C99

SYNOPSIS
DESCRIPTION
RETURN VALUE
USAGE NOTES
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

   #include <math.h>

   int fpclassify(floating x);

DESCRIPTION

fpclassify determines the class of numbers to which its argument belongs. The argument may be of any floating point type.

RETURN VALUE

fpclassify returns one of the values FP_ZERO, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL, or FP_NAN to indicate a zero, infinite, normal, subnormal (or denormalized), or invalid (NaN) value.

USAGE NOTES

When called from a function compiled without the bfp option, fpclassify will always return either FP_ZERO or FP_NORMAL.

RELATED FUNCTIONS

isfinite, isinf, isnan, isnormal

SEE ALSO

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

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