Content-type: text/html Man page of fmod

fmod

Section: C Library Functions (3)
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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

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

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:


FunctionExceptional ArgumentRoutine 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: 02:41:36 GMT, October 02, 2010