The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

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

    NAME

    ceil, ceilf, ceill - ceiling function: smallest integral value not
    less than argument
     
    

    SYNOPSIS

    #include <math.h>
    
    double ceil(double x);
    
    float ceilf(float x);
    long double ceill(long double x);

    Link with -lm.

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

    ceilf(), ceill(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    These functions return the smallest integral value that is not less than x.

    For example, ceil(0.5) is 1.0, and ceil(-0.5) is 0.0.  

    RETURN VALUE

    These functions return the ceiling of x.

    If x is integral, +0, -0, NaN, or infinite, x itself is returned.  

    ERRORS

    No errors occur. POSIX.1-2001 documents a range error for overflows, but see NOTES.  

    CONFORMING TO

    C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.  

    NOTES

    SUSv2 and POSIX.1-2001 contain text about overflow (which might set errno to ERANGE, or raise an FE_OVERFLOW exception). In practice, the result cannot overflow on any current machine, so this error-handling stuff is just nonsense. (More precisely, overflow can happen only when the maximum value of the exponent is smaller than the number of mantissa bits. For the IEEE-754 standard 32-bit and 64-bit floating-point numbers the maximum value of the exponent is 128 (respectively, 1024), and the number of mantissa bits is 24 (respectively, 53).)

    The integral value returned by these functions may be too large to store in an integer type (int, long, etc.). To avoid an overflow, which will produce undefined results, an application should perform a range check on the returned value before assigning it to an integer type.  

    SEE ALSO

    floor(3), lrint(3), nearbyint(3), rint(3), round(3), trunc(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
    NOTES
    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