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SCALBLN(P)		   POSIX Programmer's Manual		    SCALBLN(P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl -	compute	 expo‐
       nent using FLT_RADIX

SYNOPSIS
       #include <math.h>

       double scalbln(double x, long n);
       float scalblnf(float x, long n);
       long double scalblnl(long double x, long n);
       double scalbn(double x, int n);
       float scalbnf(float x, int n);
       long double scalbnl(long double x, int n);

DESCRIPTION
       These  functions	 shall	compute x * FLT_RADIX**n efficiently, not nor‐
       mally by computing FLT_RADIX**n explicitly.

       An application wishing to check for error situations should  set	 errno
       to  zero	 and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
       functions.  On return, if errno is non-zero or  fetestexcept(FE_INVALID
       |  FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
       occurred.

RETURN VALUE
       Upon   successful   completion,	 these	  functions    shall	return
       x * FLT_RADIX**n.

       If the result would cause overflow, a range error shall occur and these
       functions shall return ±HUGE_VAL, ±HUGE_VALF, and ±HUGE_VALL (according
       to the sign of x) as appropriate for the return type of the function.

       If the correct value would cause underflow, and is not representable, a
       range error may occur, and    either 0.0 (if supported), or   an imple‐
       mentation-defined value shall be returned.

       If x is NaN, a NaN shall be returned.

       If x is ±0 or ±Inf, x shall be returned.

       If n is 0, x shall be returned.

       If  the	correct	 value	would cause underflow, and is representable, a
       range error may occur and the correct value shall be returned.

ERRORS
       These functions shall fail if:

       Range Error
	      The result overflows.

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then  errno  shall  be  set  to	[ERANGE].  If  the  integer expression
       (math_errhandling & MATH_ERREXCEPT)  is	non-zero,  then	 the  overflow
       floating-point exception shall be raised.

       These functions may fail if:

       Range Error
	      The result underflows.

       If  the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
       then errno  shall  be  set  to  [ERANGE].  If  the  integer  expression
       (math_errhandling  &  MATH_ERREXCEPT)  is  non-zero, then the underflow
       floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       On  error,  the	expressions  (math_errhandling	 &   MATH_ERRNO)   and
       (math_errhandling  & MATH_ERREXCEPT) are independent of each other, but
       at least one of them must be non-zero.

RATIONALE
       These functions are named so as to avoid conflicting with the  histori‐
       cal  definition of the scalb() function from the Single UNIX Specifica‐
       tion.  The difference is that the scalb() function has a	 second	 argu‐
       ment  of double instead of int. The scalb() function is not part of the
       ISO C standard. The three functions whose second type is long are  pro‐
       vided  because  the factor required to scale from the smallest positive
       floating-point value to the largest finite  one,	 on  many  implementa‐
       tions, is too large to represent in the minimum-width int format.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept()	, fetestexcept() , scalb() , the Base Definitions vol‐
       ume of IEEE Std 1003.1-2001, Section 4.18, Treatment  of	 Error	Condi‐
       tions for Mathematical Functions, <math.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			    SCALBLN(P)
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