trunc - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEtrunc, truncf, truncl − round to integer, toward zero

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double trunc(double x); float truncf(float x); long double truncl(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): trunc(), truncf(), truncl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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DESCRIPTIONThese functions round x to the nearest integer value that is not larger in magnitude than x.

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RETURN VALUEThese functions return the rounded integer value, in floating format. If x is integral, infinite, or NaN, x itself is returned.

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ERRORSNo errors occur.

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue trunc(), truncf(), truncl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008.

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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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SEE ALSOceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3) 0

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