The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

nan (3)
  • nan (3) ( Solaris man: Библиотечные вызовы )
  • nan (3) ( Русские man: Библиотечные вызовы )
  • >> nan (3) ( Linux man: Библиотечные вызовы )
  • nan (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    nan, nanf, nanl - return 'Not a Number'
     
    

    SYNOPSIS

    #include <math.h>

    double nan(const char *tagp);
    float nanf(const char *tagp);
    long double nanl(const char *tagp);

    Link with -lm.

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

    nan(), nanf(), nanl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    These functions return a representation (determined by tagp) of a quiet NaN. If the implementation does not support quiet NaNs, these functions return zero.

    The call nan(char-sequence) is equivalent to:

    
        strtod("NAN(char-sequence)", NULL);
    

    Similarly, calls to nanf() and nanl() are equivalent to analogous calls to strtof(3) and strtold(3).

    The argument tagp is used in an unspecified manner. On IEEE 754 systems, there are many representations of NaN, and tagp selects one. On other systems it may do nothing.  

    VERSIONS

    These functions first appeared in glibc in version 2.1.  

    CONFORMING TO

    C99, POSIX.1-2001. See also IEC 559 and the appendix with recommended functions in IEEE 754/IEEE 854.  

    SEE ALSO

    isnan(3), strtod(3), math_error(7)  

    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
    VERSIONS
    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