Java – Math.powの例

In Math
2^8 = 2x2x2x2x2x2x2x2 =256

In Java
Math.pow(2, 8)

package com.mkyong.test;

import java.text.DecimalFormat;

public class TestPower {

    static DecimalFormat df = new DecimalFormat(".00");

    public static void main(String[]args) {

       //1. Math.pow returns double, need cast, display 256
        int result = (int) Math.pow(2, 8);
        System.out.println("Math.pow(2, 8) : " + result);

       //2. Wrong, ^ is a binary XOR operator, display 10
        int result2 = 2 ^ 8;
        System.out.println("2 ^ 8 : " + result2);

       //3. Test double , display 127628.16
        double result3 = Math.pow(10.5, 5);
        System.out.println("Math.pow(10.5, 5) : " + df.format(result3));

    }

}

Math.pow(2, 8) : 256
2 ^ 8 : 10
Math.pow(10.5, 5) : 127628.16