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

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

SYNOPSIS
       #include 

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

       Link with -lm.

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

       scalb():
           BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 500 ||
           XOPENSOURCE && XOPENSOURCEEXTENDED
       scalbf(), scalbl():
           BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600

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

           x * FLTRADIX ** exp

       The definition of FLTRADIX can be obtained by including .

RETURN VALUE
       On success, these functions return x * FLTRADIX ** 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
       HUGEVAL, HUGEVALF, or HUGEVALL, 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 matherror(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 (FEINVALID) is raised.

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

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

       These functions do not set errno.

ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       ┌─────────────────────────────┬───────────────┬─────────┐
       │Interface                    │ Attribute     │ Value   │
       ├─────────────────────────────┼───────────────┼─────────┤
       │scalb(), scalbf(), scalbl()  │ Thread safety │ MT-Safe │
       └─────────────────────────────┴───────────────┴─────────┘
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 3.53 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/.



                                  2013-03-23                          SCALB(3)