# Java Program - Power of a Number

If **power (or exponential)** of number indicates how many the number is multiplied by itself to get the final number. For example:

*x* raised to the power *2* = x² = x*x

*x* raised to the power *3* = x³ = x*x*x

### Example: Using conditional statement

In the below example, a method called *Power()* is created to calculate power of a number. It uses *while* loop to achieve this. This method can be used to calculate the power of a number where power should be a non-negative integer.

public class MyClass { static void Power(double x, int n) { double finalnum = 1; int n1 = n; while(n1 > 0){ finalnum = finalnum * x; n1--; } System.out.println(x + " raised to the power " + n + " = " + finalnum); } public static void main(String[] args) { Power(3, 5); Power(5, 0); Power(6, 2); } }

The above code will give the following output:

3.0 raised to the power 5 = 243.0 5.0 raised to the power 0 = 1.0 6.0 raised to the power 2 = 36.0

### Example: Using pow() method of Java Math Class

The pow() method of Java Math class can also be used to calculate power of a number. It can be used to calculate *x ^{n}* for any value of n (n can be negative or fraction).

import java.lang.Math; public class MyClass { public static void main(String[] args) { double x = 3, y = 5, z = 6; double a = 5, b = 0, c = 2; System.out.println(x + " raised to the power " + a + " = " + Math.pow(x, a)); System.out.println(y + " raised to the power " + b + " = " + Math.pow(y, b)); System.out.println(z + " raised to the power " + c + " = " + Math.pow(z, c)); } }

The above code will give the following output:

3.0 raised to the power 5.0 = 243.0 5.0 raised to the power 0.0 = 1.0 6.0 raised to the power 2.0 = 36.0