| ISNORMAL(3) | Library Functions Manual | ISNORMAL(3) |
isnormal — test
for normal value
Standard C Library (libc, -lc)
#include
<math.h>
int
isnormal(real-floating
x);
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.
It is determined whether the value of x is normal, and neither zero, subnormal, infinite nor NaN.
It is determined whether the value of x is finite, and neither true zero, dirty zero nor ROP.
The isnormal() macro returns a non-zero
value if the value of x is finite. Otherwise 0 is
returned.
No errors are defined.
The isnormal() macro conforms to
ISO/IEC 9899:1999
(“ISO C99”).
| October 29, 2003 | NetBSD 11.0 |