remainder

, remainderf

, remainderl

- remainder function

Synopsis

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);

Description

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.

Return Values

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.

Errors

These functions will fail if:

Domain Error

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.

Usage

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.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

abs(3C), div(3C), feclearexcept(3M), fetestexcept(3M), attributes(5), standards(5)