Data.Colour.RGB:hslsv from colour-2.3.3, E

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\[\frac{x - y}{x} \]
(FPCore (x y) :precision binary64 (/ (- x y) x))
double code(double x, double y) {
	return (x - y) / x;
}
real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x - y) / x
end function
public static double code(double x, double y) {
	return (x - y) / x;
}
def code(x, y):
	return (x - y) / x
function code(x, y)
	return Float64(Float64(x - y) / x)
end
function tmp = code(x, y)
	tmp = (x - y) / x;
end
code[x_, y_] := N[(N[(x - y), $MachinePrecision] / x), $MachinePrecision]
\frac{x - y}{x}