scalb

       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 ||
           _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
       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.


       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 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.



                                  2010-09-20                          SCALB(3)
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