Compute the floating point remainder
#include <math.h> double remainder( double x, double y ); float remainderf( float x, float y ); long double remainderl( long double x, long double y );
These functions return the floating point remainder r = x - ny, where y is nonzero. The value n is the integral value nearest the exact value x/y. When |n - x/y| = ½, the value n is chosen to be even.
The behavior of remainder() 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 |