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Linux 2.6 - man page for remquo (linux section 3posix)

REMQUO(P)			    POSIX Programmer's Manual				REMQUO(P)

       remquo, remquof, remquol - remainder functions

       #include <math.h>

       double remquo(double x, double y, int *quo);
       float remquof(float x, float y, int *quo);
       long double remquol(long double x, long double y, int *quo);

       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 con-
       gruent modulo 2**n to the magnitude of the integral quotient of x/ y, where n is an imple-
       mentation-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.

       These functions shall fail if:

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

       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.


       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.

       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.


       feclearexcept()	 ,  fetestexcept()  ,  remainder()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for  Mathematical  Func-
       tions, <math.h>

       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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					REMQUO(P)

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