Content-type: text/html Man page of fmod

# fmod

Section: C Library Functions (3)

## NAME

fmod, drem, remainder - Compute the floating-point remainder

## LIBRARY

Math Library (libm.a)

## SYNOPSIS

#include <math.h>

double fmod (double x, double y); float fmodf (float x, float y); double drem (double x, double y); float dremf (float x, float y); double remainder (double x, double y); float remainderf (float x, float y);

## STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

fmod(): XPG4

remainder(): XPG4-UNIX

## DESCRIPTION

The fmod() and fmodf() functions return the remainder r = x - n*y, where n = trunc(x/y). The result has the same sign as x and magnitude less than the magnitude of y. The remainder is computed exactly and |r| is less than or equal to |y|/2.

The drem(), dremf(), remainder(), and remainderf() functions return the remainder r = x - n*y, where n = rint(x/y). Additionally, if |n - x/y|=1/2, then n is even. The remainder is computed exactly and |r| is less than or equal to |y|/2.

The drem() and remainder() functions are aliases of each other. The dremf(), and remainderf() functions are aliases of each other.

The following table describes function behavior in response to exceptional arguments:

 Function Exceptional Argument Routine Behavior fmod(), fmodf() x = infinity Invalid argument fmod(), fmodf() y = 0 Invalid argument drem(), dremf() x = infinity Invalid argument drem(), dremf() y = 0 Invalid argument remainder() x = infinity Invalid argument remainderf() x = infinity Invalid argument remainder() y = 0 Invalid argument remainderf() y = 0 Invalid argument
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## Index

NAME
LIBRARY
SYNOPSIS
STANDARDS
DESCRIPTION

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Time: 02:42:39 GMT, October 02, 2010