Integer power, negative too

You are given a real number $x \ne 0$ and an integer $n$. Compute $x^n$ with a recursive function:

$x^n = \begin{cases} 1, & n = 0, \\ x \cdot x^{n-1}, & n > 0, \\ 1 / x^{-n}, & n < 0. \end{cases}$

A single line with $x$ and $n$. $x$ has at most $2$ digits after the point, $0.1 \le |x| \le 10$; $|n| \le 20$. It is guaranteed that $0.001 \le |x^n| \le 10^6$.

$x^n$ with exactly $4$ digits after the point (for example, -0.1250).

A negative power reduces to a positive one: $2^{-3} = 1 / 2^3 = 0.125$, so the answer to the second example is $(-2)^{-3} = -0.1250$. Python — print(f"{v:.4f}"), C++ — printf("%.4f\n", v), Go — fmt.Printf("%.4f\n", v).