REMAINDER(3) Linux Programmers Manual REMAINDER(3)
drem, dremf, dreml, remainder, remainderf, remainderl - floating-point
/* 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)):
remainder(), remainderf(), remainderl(): _SVID_SOURCE || _BSD_SOURCE ||
_XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
drem(), dremf(), dreml(): _SVID_SOURCE || _BSD_SOURCE
The remainder() function computes 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 this quotient is 1/2 (mod 1), it is rounded to
the nearest even number (independent of the current rounding mode). If
the return value is 0, it has the sign of x.
The drem() function does precisely the same thing.
The remainder() function returns the remainder, unless y is zero, when
the function fails and errno is set.
EDOM The denominator y is zero.
IEC 60559. The functions remainder(), remainderf(), and remainderl()
are from C99.
The function drem() is from 4.3BSD. The float and long double variants
dremf() and dreml() exist on some systems, such as Tru64 and glibc2.
Avoid the use of these functions in favor of remainder() etc.
The call "remainder(29.0, 3.0)" returns -1.
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.