minix man page for trunc

TRUNC(3)                                                     Linux Programmer's Manual                                                    TRUNC(3)

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

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

DESCRIPTION
       These functions round x to the nearest integer not larger in absolute value.

RETURN VALUE
       These functions return the rounded integer value.

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

ERRORS
       No errors occur.

VERSIONS
       These functions first appeared in glibc in version 2.1.

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

       +----------------------------+---------------+---------+
       |Interface                   | Attribute     | Value   |
       +----------------------------+---------------+---------+
       |trunc(), truncf(), truncl() | Thread safety | MT-Safe |
       +----------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.

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

COLOPHON
       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

                                                                    2017-09-15                                                            TRUNC(3)