remainder(), remainderf(), remainderl()

Updated: May 06, 2022

Compute the floating point remainder

Synopsis:

#include <math.h>

double remainder( double x, 
                  double y );

float remainderf( float x, 
                  float y );

long double remainderl( long double x, 
                        long double y );

Arguments:

x
The numerator of the division.
y
The denominator.

Library:

libm
The general-purpose math library.
libm-sve
(QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

These functions return the floating point remainder r = x - ny, where y is nonzero. The value n is the integral value nearest the exact value x/y. When |n - x/y| = ½, the value n is chosen to be even.

The behavior of remainder() is independent of the rounding mode.

To check for error situations, use feclearexcept() and fetestexcept(). For example:

Returns:

The floating point remainder r = x - ny, where y is nonzero.

If: These functions return: Errors:
x is ±Inf NaN FE_INVALID
x or y is NaN NaN
x isn't NaN, and y is zero NaN FE_INVALID

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.

Classification:

C11, POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes