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

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NAMEfmod, fmodf, fmodl − floating-point remainder function

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double fmod(double x, double y); float fmodf(float x, float y); long double fmodl(long double x, long double y);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fmodf(), fmodl(): _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 compute the floating-point remainder of dividing x by y. The return value is x − n * y, where n is the quotient of x / y, rounded toward zero to an integer.

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RETURN VALUEOn success, these functions return the value x − n*y, for some integer n, such that the returned value has the same sign as x and a magnitude less than the magnitude of y. If x or y is a NaN, a NaN is returned. If x is an infinity, a domain error occurs, and a NaN is returned. If y is zero, a domain error occurs, and a NaN is returned. If x is +0 (−0), and y is not zero, +0 (−0) is returned.

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ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is an infinity  errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised. Domain error: y is zero  errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue fmod(), fmodf(), fmodl() 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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BUGSBefore glibc 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred for an infinite x.

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SEE ALSOremainder(3) 0

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