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man:scalbnf

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

NAME

     scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply float-
     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():
            _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
                || /* Since glibc 2.19: */ _DEFAULT_SOURCE
     scalbn(), scalbnf(), scalbnl():
            _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
                || /* Since glibc 2.19: */ _DEFAULT_SOURCE
                || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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.
     The following errors can occur:
     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.

VERSIONS

     These functions first appeared in glibc in version 2.1.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     allbox;  lbw33  lb  lb  l  l l.  Interface Attribute Value T{ scalbn(),
     scalbnf(), scalbnl(),
     scalbln(), scalblnf(), scalblnl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.

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 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                        SCALBLN(3)
/data/webs/external/dokuwiki/data/pages/man/scalbnf.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1

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