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SCALB(3)		   Linux Programmer's Manual		      SCALB(3)

NAME
       scalb,  scalbf,	scalbl	-  multiply  floating-point number by integral
       power of radix (OBSOLETE)

SYNOPSIS
       #include <math.h>

       double scalb(double x, double exp);
       float scalbf(float x, double exp);
       long double scalbl(long double x, double exp);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       scalb(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500
       scalbf(), scalbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600

DESCRIPTION
       These functions multiply their first argument x by FLT_RADIX  (probably
       2) to the power of exp, that is:

	   x * FLT_RADIX ** exp

       The definition of FLT_RADIX can be obtained by including <float.h>.

RETURN VALUE
       On success, these functions return x * FLT_RADIX ** exp.

       If x or exp is a NaN, a NaN is returned.

       If  x is positive infinity (negative infinity), and exp is not negative
       infinity, positive infinity (negative infinity) is returned.

       If x is +0 (-0), and exp is not positive infinity, +0 (-0) is returned.

       If x is zero, and exp is positive infinity, a domain error occurs,  and
       a NaN is returned.

       If  x  is  an  infinity,	 and  exp is negative infinity, a domain error
       occurs, and a NaN is returned.

       If the result overflows, a range error occurs, and the functions return
       HUGE_VAL,  HUGE_VALF,  or HUGE_VALL, respectively, with a sign the same
       as x.

       If the result underflows, a  range  error  occurs,  and	the  functions
       return zero, with a sign the same as x.

ERRORS
       See  math_error(7) for information on how to determine whether an error
       has occurred when calling these functions.

       The following errors can occur:

       Domain error: x is 0, and exp is positive infinity, or  x  is  positive
       infinity	 and  exp is negative infinity and the other argument is not a
       NaN
	      An invalid floating-point exception (FE_INVALID) is raised.

       Range error, overflow
	      An overflow floating-point exception (FE_OVERFLOW) is raised.

       Range error, underflow
	      An underflow floating-point exception (FE_UNDERFLOW) is raised.

       These functions do not set errno.

CONFORMING TO
       scalb()	is  specified  in  POSIX.1-2001,   but	 marked	  obsolescent.
       POSIX.1-2008 removes the specification of scalb(), recommending the use
       of scalbln(3), scalblnf(3), or scalblnl(3) instead.  The scalb()	 func‐
       tion is from 4.3BSD.

       scalbf()	 and  scalbl()	are  unstandardized;  scalbf() is nevertheless
       present on several other systems

SEE ALSO
       ldexp(3), scalbln(3)

COLOPHON
       This page is part of release 3.23 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

				  2009-03-15			      SCALB(3)
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