Compute the floating point remainder
#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 compute the floating-point remainder of the division operation x / y, as remainder() does. Additionally, they store the sign and at least the three of the last bits of x / y in the location that quo points to, sufficient to determine the octant of the result within a period.
The behavior of remquo() is independent of the rounding mode.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
The floating point remainder r = x - ny, where y is nonzero.
If: | These functions return: | Errors: |
---|---|---|
x is Inf | NaN | FE_INVALID |
x or y is NaN | NaN | — |
x isn't NaN, and y is zero | NaN | FE_INVALID |
These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |