isnormal - Macro to test for a normal value

Syntax	#include <math.h> C11 int isnormal(x); (End)
Description	x has to be an argument of type float, double or long double. The isnormal() macro determines whether its argument value is normal, i.e. x is normalized and not 0, Infinity or NaN.
Return val.	Value != 0	if x is normalized and does not have the values 0, +/-NaN or +/-Infinity.
	0	otherwise.
See also	fpclassify, isfinite, isinf, isnan, math.h.