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);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
These functions round
x to the nearest integer value that is not larger in magnitude than
These functions return the rounded integer value, in floating format.
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).
|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 (
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.
This page is part of release 5.10 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/.