ilogb, ilogbf, ilogbl - get exponent part of floating-point number

Syntax	#include <math.h> int ilogb(double x); C11 int ilogbf(float x); int ilogbl(long double x); (End)
Description	These functions return the exponent part of x. In form, for all xs not equal to zero, the return value is the integral, signed part of logr |x|, where r is the base of the floating-point arithmetic of the processor (in BS2000, r = 16). The ilogb(x) function call is equivalent to the (int)logb(x) call.
Return val.	Exponent part of x
		if successful.
	INT_MIN	if x = 0.0.
See also	logb(), math.h.