Tests for a normal value.
#include <math.h> int isnormal (x) real-floating x;
The isnormal macro determines whether its argument value is normal (neither zero, subnormal, infinite, nor NaN) or not. An argument represented in a format wider than its semantic type is converted to its semantic type. Determination is based on the type of the argument.
| x | Specifies the value to be tested. |
The isnormal macro returns a nonzero value if its argument has a normal value.
fpclassify Macro, isfinite Macro, isinf Subroutine, class, _class, finite, isnan, or unordered Subroutines.
The signbit Subroutine in AIX 5L Version 5.2 Technical Reference: Base Operating System and Extensions Volume 2.
math.h in AIX 5L Version 5.2 Files Reference.