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 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. 2013-06-21 TRUNC(3)
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