Tests if a value is a computable number.
#include <math.h> int isnormal(x);
x
A float, double, or long double value to test.
This macro returns true if the argument is a normalized number. A normalized number is not zero, not subnormal, not infinite, and not NaN.
This facility may not be available on configurations of the EWL that run on platforms that do not have floating-point math capabilities.