Java math.pow函数用法详解

public static double pow(double a, double b)

double result = Math.pow(2, 3);
System.out.println(result);

8.0

double result = Math.pow(3, 0.5);
System.out.println(result);

1.7320508075688772

double result = Math.pow(Math.E, Math.PI);
System.out.println(result);

23.140692632779267

public static double fastPow(double a, int b) {
    if (b == 0) {
        return 1;
    }
    if (b == 1) {
        return a;
    }
    if (b % 2 == 0) {
        double half = fastPow(a, b / 2);
        return half * half;
    } else {
        double half = fastPow(a, (b - 1) / 2);
        return half * half * a;
    }
}

double result = fastPow(2, 10);
System.out.println(result);

1024.0