NAME
isnormal — test
for a normal value
SYNOPSIS
#include
<math.h>
int isnormal(real-floating x);
DESCRIPTION
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.
The isnormal () macro shall determine
whether its argument value is normal (neither zero, subnormal, infinite, nor
NaN). First, an argument represented in a format wider than its semantic
type is converted to its semantic type. Then determination is based on the
type of the argument.
RETURN VALUE
The isnormal () macro shall return a
non-zero value if and only if its argument has a normal value.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
fpclassify(3), isfinite(3), isinf(3), isnan(3), signbit(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <math.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.
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