TRUNCSection: Linux Programmer's Manual (3)
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NAMEtrunc, truncf, truncl - round to integer, towards 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)):
DESCRIPTIONThese functions round x to the nearest integer not larger in absolute value.
RETURN VALUEThese functions return the rounded integer value.
ERRORSNo errors occur.
VERSIONSThese functions first appeared in glibc in version 2.1.
CONFORMING TOC99, POSIX.1-2001.
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.
SEE ALSOceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
COLOPHONThis page is part of release 3.21 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/.