drem, dremf, dreml, remainder, remainderf, remainderl - floating-point remainder function
#include <math.h>
/* The C99 versions */
double remainder(double x, double y);
float remainderf(float x, float y);
long double remainderl(long double x, long double y);
/* Obsolete synonyms */
double drem(double x, double y);
float dremf(float x, float y);
long double dreml(long double x, long double y);
Link with -lm.
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.