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.
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.
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.
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