NAME
fmod, fmodf, fmodl - floating-point remainder function SYNOPSIS
#include
double fmod(double x, double y); float fmodf(float x, float y); long double fmodl(long double x, long double y); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): fmodf(), fmodl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 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 matherror(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 (FEINVALID) is raised. Domain error: y is zero
errno is set to EDOM. An invalid floating-point exception (FEINVALID) is raised. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤
│fmod(), fmodf(), fmodl() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘ 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. SEE ALSO remainder(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2012-03-15 FMOD(3)