NAME
isnormal —
test for normal value
LIBRARY
library “libc”
SYNOPSIS
#include
<math.h>
int
isnormal(real-floating
x);
DESCRIPTION
Theisnormal()
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
STANDARDS
The isnormal() macro conforms to
ISO/IEC 9899:1999
(“ISO C99”).