scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - load exponent of base-independent floating-point number

Syntax	#include <math.h> C11 double scalbn(double x, int n); float scalbnf(float x, int n); long double scalbnl(long x, int n); double scalbln(double x, long n); float scalblnf(float x, long n); long double scalblnl(long double x, long n); (End)
Description	These functions compute x*r n, where r is the base of the machine-dependent floating-point arithmetic, without computing rn explicitly. For r=2, scalb() is equivalent to ldexp().
Return val.	x *r n	if successfull.
	+/-HUGE_VAL +/-HUGE_VALF +/-HUGE_VALL	depending on the function type and the sign of x, if an overflow occurs. errno is set to indicate the error.
	0	if scalb() causes an underflow. errno is set to ERANGE.
Errors	scalbn(), scalbnf(), scalbnl(), scalbln(), scalblnf() and scalblnl() will fail if:
	ERANGE	overflow or underflow.
Notes	An application that wants to check the error situation should set errno to 0 before the 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(), scalb(), math.h.