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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