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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(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L DESCRIPTION These functions round x to the nearest integer value that is not larger in magnitude than x. 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. VERSIONS These functions first appeared in glibc in version 2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βtrunc(), truncf(), truncl() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. 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 undeβ fined 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) 2021-03-22 TRUNC(3)