c99 [ flag... ] file... –lm [ library... ] #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 when y is non-zero. 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.
Upon successful completion, these functions return the floating point remainder r = x − ny when y is non-zero.
If x or y is NaN, a NaN is returned.
If x is infinite or y is 0 and the other is non-NaN, a domain error occurs and a NaN is returned.
These functions will fail if:
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_ERREXCEPT) is non-zero, then the invalid floating-point exception is raised.
The remainder() function sets errno to EDOM if y argument is 0 or the x argument is positive or negative infinity.
An application wanting to check for error situations can set errno to 0 before calling remainder(). On return, if errno is non-zero, an error has occurred. The remainderf() and remainderl() functions do not set errno.
See attributes(5) for descriptions of the following attributes: