trunc (3) - Linux Man Pages
trunc: round to integer, toward zero
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)):
trunc(), truncf(), truncl():
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
DESCRIPTIONThese functions round x to the nearest integer value that is not larger in magnitude than x.
RETURN VALUEThese functions return the rounded integer value, in floating format.
ERRORSNo errors occur.
VERSIONSThese functions first appeared in glibc in version 2.1.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|trunc(), truncf(), truncl()||Thread safety||MT-Safe|
CONFORMING TOC99, POSIX.1-2001, POSIX.1-2008.
NOTESThe 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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