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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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TRUNC(3) Linux Programmer's Manual TRUNC(3)
trunc, truncf, truncl - round to integer, toward zero
#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
These functions round x to the nearest integer value that is not
larger in magnitude than x.
These functions return the rounded integer value, in floating
format.
If x is integral, infinite, or NaN, x itself is returned.
No errors occur.
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│trunc(), truncf(), truncl() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
C99, POSIX.1-2001, POSIX.1-2008.
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.
ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
This page is part of release 5.13 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/.
2021-03-22 TRUNC(3)
Pages that refer to this page: ceil(3), floor(3), rint(3), round(3)
Copyright and license for this manual page
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