drem, dremf, dreml, remainder, remainderf, remainderl - floating-point remainder function
#include <math.h>
double remainder(double x, double y);
float remainderf(float x, float y);
long double remainderl(long double x, long double y);
/* Obsolete synonyms */
[[deprecated]] double drem(double x, double y);
[[deprecated]] float dremf(float x, float y);
[[deprecated]] long double dreml(long double x, long double y);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
These functions compute the remainder of dividing x
by
y
. The return value is x
-n
*y
, where
n
is the value x / y
, rounded to the nearest integer.
If the absolute value of x
-n
*y
is 0.5,
n
is chosen to be even.
These functions are unaffected by the current rounding mode (see fenv(3)).
The drem() function does precisely the same thing.
On success, these functions return the floating-point remainder,
x
-n
*y
. If the return value is 0, it has the
sign of x
.
If x
or y
is a NaN, a NaN is returned.
If x
is an infinity, and y
is not a NaN, a domain
error occurs, and a NaN is returned.
If y
is zero, and x
is not a NaN, a domain error
occurs, and a NaN is returned.
The call "remainder(29.0, 3.0)" returns -1.