The remquo(), remquof(), and remquol() functions shall
compute the same remainder as the remainder(), remainderf(), and
remainderl() functions, respectively. In the object pointed to by
quo, they store a value whose sign is the sign of x/ y
and whose magnitude is congruent modulo 2 **n to the magnitude of the
integral quotient of x/ y, where n is an
implementation-defined integer greater than or equal to 3.
An application wishing to check for error situations should set errno to
zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
functions. On return, if errno is non-zero or
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
non-zero, an error has occurred.
These functions shall return x REM y.
If x or y is NaN, a NaN shall be returned.
If x is ±Inf or y is zero and the other argument is
non-NaN, a domain error shall occur, and either a NaN (if supported), or an
implementation-defined value shall be returned.
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.
These functions are intended for implementing argument reductions which can
exploit a few low-order bits of the quotient. Note that x may be so
large in magnitude relative to y that an exact representation of the
quotient is not practical.
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