IEEE Std 1003.1-2001

Copyright © 2001 The IEEE and The Open Group, All Rights reserved.

remquo, remquof, remquol - remainder functions

#include <math.h>

double remquo(doublex, doubley, int *quo);

float remquof(floatx, floaty, int *quo);

long double remquol(long doublex, long doubley, int *quo);

^{[CX]}The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.The

remquo(),remquof(), andremquol() functions shall compute the same remainder as theremainder(),remainderf(), andremainderl() functions, respectively. In the object pointed to byquo, they store a value whose sign is the sign ofx/yand whose magnitude is congruent modulo 2to the magnitude of the integral quotient of^{n}x/y, wherenis an implementation-defined integer greater than or equal to 3.An application wishing to check for error situations should set

errnoto zero and callfeclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, iferrnois non-zero orfetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.

These functions shall return

xREMy.

^{[MX]}Ifxoryis NaN, a NaN shall be returned.If

xis ±Inf oryis 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
^{[MX]}Thexargument is ±Inf, or theyargument is ±0 and the other argument is non-NaN.If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then

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

None.

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

xmay be so large in magnitude relative toythat an exact representation of the quotient is not practical.

None.

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

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.

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