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   truncl    ( 3 )

округлить до целого числа, в сторону нуля (round to integer, toward zero)

Имя (Name)

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


Синопсис (Synopsis)

#include <math.h>

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

Link with -lm.

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

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


Описание (Description)

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


Возвращаемое значение (Return value)

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

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


Ошибки (Error)

No errors occur.


Версии (Versions)

These functions first appeared in glibc in version 2.1.


Атрибуты (Attributes)

For an explanation of the terms used in this section, see attributes(7).

┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface Attribute Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │trunc(), truncf(), truncl() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘


Стандарты (Conforming to)

C99, POSIX.1-2001, POSIX.1-2008.


Примечание (Note)

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.


Смотри также (See also)

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