The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

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

    NAME

    ilogb, ilogbf, ilogbl - get integer exponent of a floating-point value
     
    

    SYNOPSIS

    #include <math.h>

    int ilogb(double x);
    int ilogbf(float x);
    int ilogbl(long double x);

    Link with -lm.

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

    ilogb(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
    ilogbf(), ilogbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    These functions return the exponent part of their argument as a signed integer. When no error occurs, these functions are equivalent to the corresponding logb(3) functions, cast to int.  

    RETURN VALUE

    On success, these functions return the exponent of x, as a signed integer.

    If x is zero, then a domain error occurs, and the functions return FP_ILOGB0.

    If x is a NaN, then a domain error occurs, and the functions return FP_ILOGBNAN.

    If x is negative infinity or positive infinity, then a domain error occurs, and the functions return INT_MAX.  

    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 or a NaN
    An invalid floating-point exception (FE_INVALID) is raised.
    These functions do not set errno for this case.
    Domain error: x is an infinity
    These functions do not set errno or raise an exception for this case.
     

    CONFORMING TO

    C99, POSIX.1-2001.  

    SEE ALSO

    log(3), logb(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


    Поиск по тексту MAN-ов: 




    Партнёры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2024 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру