NAME

       remainder, remainderf, remainderl - remainder function

SYNOPSIS

       #include <math.h>

       double remainder(double x, double y);
       float remainderf(float x, float y);
       long double remainderl(long double x, long double y);

DESCRIPTION

       These functions shall return the floating-point remainder r= x- ny when y is non-zero. The
       value n is the integral value nearest the exact value x/ y.  When |n-x/y|=0.5, the value n
       is chosen to be even.

       The behavior of remainder() shall be independent of the rounding mode.

RETURN VALUE

       Upon  successful  completion, these functions shall return the floating-point remainder r=
       x- ny when y is non-zero.

       If x or y is NaN, a NaN shall be returned.

       If x is infinite or y is 0 and the other is non-NaN,  a  domain  error  shall  occur,  and
       either a NaN (if supported), or an implementation-defined value shall be returned.

ERRORS

       These functions shall fail if:

       Domain Error
              The x argument is ±Inf, or the y argument is ±0 and the other argument is non-NaN.

       If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
       set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is  non-zero,
       then the invalid floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       On  error,  the  expressions  (math_errhandling  &  MATH_ERRNO)  and  (math_errhandling  &
       MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       abs() , div() , feclearexcept() , fetestexcept() , ldiv() , the Base Definitions volume of
       IEEE Std 1003.1-2001,  Section  4.18,  Treatment  of  Error  Conditions  for  Mathematical
       Functions, <math.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .