TRUNC(3) Linux Programmer's Manual TRUNC(3)NAME
trunc, truncf, truncl - round to interger, towards zero
SYNOPSIS
#include <math.h>
double trunc(double x);
float truncf(float x);
long double truncl(long double x);
DESCRIPTION
These functions round x to the nearest integer not larger in absolute value.
RETURN VALUE
The rounded integer value. If x is integral, infinite or NaN, x itself is returned.
ERRORS
None.
CONFORMING TO
C99.
SEE ALSO ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
2001-05-31 TRUNC(3)
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TRUNC(3) Linux Programmer's Manual TRUNC(3)NAME
trunc, truncf, truncl - round to integer, towards 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; 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.
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 3.25 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/.
2008-08-11 TRUNC(3)
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