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FMOD(3) Linux Programmer's Manual FMOD(3)


     fmod, fmodf, fmodl - floating-point remainder function


     #include <math.h>
     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 feature_test_macros(7)):
     fmodf(), fmodl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE


     These  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.


     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.


     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.


     For  an  explanation  of  the  terms  used   in   this   section,   see
     allbox;  lbw24  lb  lb  l  l  l.   Interface Attribute Value T{ fmod(),
     fmodf(), fmodl() T}   Thread safety  MT-Safe


     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD, C89.


     Before version 2.10, the glibc implementation did not set errno to EDOM
     when a domain error occurred for an infinite x.




     This  page  is  part of release 4.16 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
                                2017-09-15                           FMOD(3)
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