ISNORMAL(3) Library Functions Manual ISNORMAL(3)

NAME

isnormaltest 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”).
October 29, 2003 NetBSD 6.1