remainder(), remainderf(), remainderl()
QNX SDP8.0C Library ReferenceAPIDeveloper
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
- 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:
- If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
- If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.
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:
- Call
feclearexcept(FE_ALL_EXCEPT)before calling remainder(), remainderf(), or remainderl(). - On return, if
fetestexcept(FE_ALL_EXCEPT)is nonzero, then an error has occurred.
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:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
Page updated: