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scalbnf (3)
  • scalbnf (3) ( FreeBSD man: Библиотечные вызовы )
  • >> scalbnf (3) ( Linux man: Библиотечные вызовы )
  • scalbnf (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl -
    multiply floating-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; or cc -std=c99
    scalbn(), scalbnf(), scalbnl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; 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 (negative 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.  

    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 3.14 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/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    VERSIONS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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