sqrt(x) - x

(FPCore (x) :precision binary64 (- (sqrt x) x))

double code(double x) {
	return sqrt(x) - x;
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = sqrt(x) - x
end function

public static double code(double x) {
	return Math.sqrt(x) - x;
}

def code(x):
	return math.sqrt(x) - x

function code(x)
	return Float64(sqrt(x) - x)
end

function tmp = code(x)
	tmp = sqrt(x) - x;
end

code[x_] := N[(N[Sqrt[x], $MachinePrecision] - x), $MachinePrecision]

\begin{array}{l}

\\
\sqrt{x} - x
\end{array}