|FMOD(3)||Linux Programmer's Manual||FMOD(3)|
NAME¶fmod, fmodf, fmodl - floating-point remainder function
#include <math.h> double fmod(double x, double y);Link with -lm.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)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;or cc -std=c99
DESCRIPTION¶The fmod() function computes 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.
RETURN VALUE¶On 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.
ERRORS¶See 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.
CONFORMING TO¶C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
BUGS¶Before version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred for an infinite x.
COLOPHON¶This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.