NAME
trunc, truncf, truncl - round to integer, toward zero SYNOPSIS
#include
double trunc(double x); float truncf(float x); long double truncl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): trunc(), truncf(), truncl(): XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 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 For an explanation of the terms used in this section, see attributes(7). ┌────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────────┼───────────────┼─────────┤
│trunc(), truncf(), truncl() │ Thread safety │ MT-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
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2013-06-21 TRUNC(3)