# truncf(3) [freebsd man page]

```TRUNC(3)						   BSD Library Functions Manual 						  TRUNC(3)

NAME
trunc, truncf, truncl -- nearest integral value with magnitude less than or equal to |x|

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
trunc(double x);

float
truncf(float x);

long double
truncl(long double x);

DESCRIPTION
The trunc(), truncf(), and truncl() functions return the nearest integral value with magnitude less than or equal to |x|.	They are equiva-
lent to rint(), rintf(), and rintl(), respectively, in the FE_TOWARDZERO rounding mode.

ceil(3), fesetround(3), floor(3), math(3), nextafter(3), rint(3), round(3)

STANDARDS
The trunc(), truncf(), and truncl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY
These routines first appeared in FreeBSD 5.3.

BSD								  April 16, 2005							       BSD```

## Check Out this Related Man Page

```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);

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

trunc(), truncf(), truncl():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

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
The trunc(), truncf(), and truncl() functions are thread-safe.

CONFORMING TO
C99, POSIX.1-2001.

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.

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

COLOPHON
This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
be found at http://www.kernel.org/doc/man-pages/.

2013-06-21								  TRUNC(3)```
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