trunc(3) [opendarwin man page]

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

NAME

     trunc -- truncate to integer value

SYNOPSIS

     #include <math.h>

     double
     trunc(double x);

     float
     truncf(float x);

DESCRIPTION

     The trunc() and truncf() functions return the integral value nearest to but no larger in magnitude than x.

SPECIAL VALUES

     trunc(+-0) returns +-0.

     trunc(+-infinity) returns +-infinity.

SEE ALSO

     ceil(3), ieee(3), rint(3), math(3)

STANDARDS

     The trunc() and truncf() functions conform to ISO/IEC 9899:1999(E).

BSD
								 January 29, 2003							       BSD

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():
	   _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

   Multithreading (see pthreads(7))
       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.

SEE ALSO

       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)