trunc(3) — Справочная страница Linux

trunc(3)                Library Functions Manual                trunc(3)

НАЗВАНИЕ

       trunc, truncf, truncl - round to integer, toward zero

БИБЛИОТЕКА

       Math library (libm, -lm)

СИНТАКСИС

       #include <math.h>

       double trunc(double x);
       float truncf(float x);
       long double truncl(long double x);

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

       trunc(), truncf(), truncl():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

ОПИСАНИЕ

       These functions round x to the nearest integer value that is not
       larger in magnitude than x.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       These functions return the rounded integer value, in floating
       format.

       If x is integral, infinite, or NaN, x itself is returned.

ОШИБКИ

       No errors occur.

АТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ trunc(), truncf(), truncl()         │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

СТАНДАРТЫ

       C11, POSIX.1-2008.

ИСТОРИЯ

       glibc 2.1.  C99, POSIX.1-2001.

ПРИМЕЧАНИЯ

       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.

СМОТРИТЕ ТАКЖЕ

       ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
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       2024-06-26.  If you discover any rendering problems in this HTML
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                       trunc(3)

Страницы, которые ссылаются на эту страницу: ceil(3), floor(3), rint(3), round(3)