scalb - load exponent of base-independent floating-point number

Syntax	#include <math.h> double scalb (double x, double n);
Description	scalb() computes x*r n , where r is the base of the machine-dependent floating-point arithmetic. For r=2, scalb() is equivalent to ldexp() .
Return val.	x *r n	if scalb() is executed successfully.
	+-HUGE_VAL	depending on the sign of x if scalb() causes an overflow. errno is set to ERANGE
	0	if scalb() causes an underflow. errno is set to ERANGE.
Errors	scalb() will fail if:
	ERANGE	scalb() attempts an overflow or underflow.
Notes	An application that wants to check the error situation should set errno to 0 before the scalb() function is called. If on the return errno is then not equal to zero, this signals an error. For BS2000 the base is r=16.
See also	ldexp(), math.h.