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    Command:

    fmod

    
    
    

    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);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           fmodf(), fmodl():
               _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.
    
    
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