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Command: fpclassify | Section: 3 | Source: MINIX | File: fpclassify.3
FPCLASSIFY(3) FreeBSD Library Functions Manual FPCLASSIFY(3)
NAME
fpclassify - classify real floating type
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <math.h>
int
fpclassify(real-floating x);
DESCRIPTION
The fpclassify() macro performs classification of its argument x. An
argument represented in a format wider than its semantic type is
converted to its semantic type first. The classification is then based
on the type of the argument.
IEEE 754
FP_INFINITE infinity, either positive or negative
FP_NAN not-a-number ("NaN")
FP_NORMAL normal
FP_SUBNORMAL subnormal
FP_ZERO zero
VAX
FP_ROP reserved operand ("ROP")
FP_DIRTYZERO dirty zero
FP_NORMAL finite
FP_ZERO true zero
RETURN VALUES
The fpclassify() macro returns the value of the number classification
macro appropriate to its argument x as described above.
ERRORS
No errors are defined.
SEE ALSO
isfinite(3), isnormal(3), math(3), signbit(3)
STANDARDS
The fpclassify() macro conforms to ISO/IEC 9899:1999 ("ISO C99").
FreeBSD 14.1-RELEASE-p8 January 14, 2004 FreeBSD 14.1-RELEASE-p8