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scalbl (3)
  • >> scalbl (3) ( Linux man: Библиотечные вызовы )
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    NAME

    scalb, scalbf, scalbl - multiply floating-point number
    by integral 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
    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.

    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 (FE_INVALID) is raised.
    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.  

    CONFORMING TO

    scalb() is specified in POSIX.1-2001, but marked obsolescent. POSIX.1-2008 removes the specification of scalb(). The scalb() function 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 3.14 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
    CONFORMING TO
    SEE ALSO
    COLOPHON


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