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)):
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.
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