scalbn

       ing-point number by integral power of radix

SYNOPSIS
       #include <math.h>

       double scalbln(double x, long int exp);
       float scalblnf(float x, long int exp);
       long double scalblnl(long double x, long int exp);

       double scalbn(double x, int exp);
       float scalbnf(float x, int exp);
       long double scalbnl(long double x, int exp);

       Link with -lm.

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

       scalbln(), scalblnf(), scalblnl():
              _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
              _POSIX_C_SOURCE >= 200112L;
              or cc -std=c99
       scalbn(), scalbnf(), scalbnl():
              _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
              _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
              or cc -std=c99

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 is a NaN, a NaN is returned.

       If x is positive infinity (negative infinity), positive infinity (nega-
       tive infinity) is returned.

       If x is +0 (-0), +0 (-0) 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 first appeared in glibc in version 2.1.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The scalbn(), scalbnf(), scalbnl(), scalbln(),  scalblnf(),  and  scal-
       blnl() functions are thread-safe.

CONFORMING TO
       C99, POSIX.1-2001.

NOTES
       These  functions  differ  from  the  obsolete  functions  described  in
       scalb(3) in the type of their second argument.  The functions described
       on this page have a second argument of an integral type, while those in
       scalb(3) have a second argument of type double.

       If FLT_RADIX equals 2 (which is usual), then scalbn() is equivalent  to
       ldexp(3).

SEE ALSO
       ldexp(3), scalb(3)

COLOPHON
       This  page  is  part of release 3.54 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/.



                                  2013-06-21                        SCALBLN(3)
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