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Command: isnormal | Section: 3 | Source: MINIX | File: isnormal.3
ISNORMAL(3) FreeBSD Library Functions Manual ISNORMAL(3)
NAME
isnormal - test for normal value
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <math.h>
int
isnormal(real-floating x);
DESCRIPTION
The isnormal() macro determines whether its argument x has a normal
value. An argument represented in a format wider than its semantic type
is converted to its semantic type first. The determination is then based
on the type of the argument.
IEEE 754
It is determined whether the value of x is normal, and neither zero,
subnormal, infinite nor NaN.
VAX
It is determined whether the value of x is finite, and neither true zero,
dirty zero nor ROP.
RETURN VALUES
The isnormal() macro returns a non-zero value if the value of x is
finite. Otherwise 0 is returned.
ERRORS
No errors are defined.
SEE ALSO
fpclassify(3), isfinite(3), math(3), signbit(3)
STANDARDS
The isnormal() macro conforms to ISO/IEC 9899:1999 ("ISO C99").
FreeBSD 14.1-RELEASE-p8 October 29, 2003 FreeBSD 14.1-RELEASE-p8