floor - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEfloor, floorf, floorl − largest integral value not greater than argument

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double floor(double x); float floorf(float x); long double floorl(long double x);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): floorf(), floorl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions return the largest integral value that is not greater than x. For example, floor(0.5) is 0.0, and floor(−0.5) is −1.0.

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RETURN VALUEThese functions return the floor of x. If x is integral, +0, −0, NaN, or an infinity, x itself is returned.

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ERRORSNo errors occur. POSIX.1-2001 documents a range error for overflows, but see NOTES.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue floor(), floorf(), floorl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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NOTESSUSv2 and POSIX.1-2001 contain text about overflow (which might set errno to ERANGE, or raise an FE_OVERFLOW exception). In practice, the result cannot overflow on any current machine, so this error-handling stuff is just nonsense. (More precisely, overflow can happen only when the maximum value of the exponent is smaller than the number of mantissa bits. For the IEEE-754 standard 32-bit and 64-bit floating-point numbers the maximum value of the exponent is 127 (respectively, 1023), and the number of mantissa bits including the implicit bit is 24 (respectively, 53).)

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

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