Compute the floating point remainder
#include <math.h> double remainder( double x, double y ); float remainderf( float x, float y ); long double remainder( long double x, long double y );
Use the -l m option to qcc to link against this library.
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.
The floating point remainder r = x - ny, where y is nonzero. If x is infinite or y is zero and the other is non-NaN, these functions return NaN.
|If an error occurs, these functions return 0, but this is also a valid mathematical result. If you want to check for errors, set errno to 0, call the function, and then check errno again. These functions don't change errno if no errors occurred.|
ANSI, POSIX 1003.1