How to write a function that can calculate power in Java. No loops

Question

I\'ve been trying to write a simple function in Java that can calculate a number to the nth power without using loops.
I then found the Math.pow(a, b) class...

Answer 1

This one handles negative exponential:

public static double pow(double base, int e) {
    int inc;
    if(e <= 0) {
        base = 1.0 / base;
        inc = 1;
    }
    else {
        inc = -1;
    }
    return doPow(base, e, inc);
}

private static double doPow(double base, int e, int inc) {
    if(e == 0) {
        return 1;
    }
    return base * doPow(base, e + inc, inc);
}