Name
trunc, truncf, truncl - round to integer, toward zeroLibrary
Math library ( libm ", " -lm )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()
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
Description
These functions round x to the nearest integer value that is not larger in magnitude thanx. Return Value
These functions return the rounded integer value, in floating format.If x is integral, infinite, or NaN, x itself is returned.
Errors
No errors occur.Attributes
For an explanation of the terms used in this section, see attributes(7).| Interface | Attribute | Value |
| T} | Thread safety | MT-Safe |
Standards
C11, POSIX.1-2008.History
glibc 2.1. 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.