Here I have shared the 4 different ways to calculate power of number in Java.
- Using Loop
- Using Recursion
- Using Math.pow()
- Using BigInteger.pow()
4 Ways to Calculate Power of Number in Java
1. Using Loop
We can calculate the power of number by repeatedly multiplying the number by itself in a loop. This method works only for positive integer power.
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package com; import java.util.Scanner; public class PowerOfNumber { public static void main(String args[]) { int n, p, result=1, i; Scanner sc = new Scanner(System.in); System.out.println("Enter a number and its power:"); n = sc.nextInt(); p =sc.nextInt(); for(i = 1; i <= p; ++i){ result = result * n; } System.out.println(result); } } |
Output
Enter a number and its power:
3
3
27
2. Using Recursion
Recursion can also be used to do this task. This method also works only for positive integer power.
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package com; import java.util.Scanner; public class PowerOfNumber { public static void main(String args[]) { int n, p; Scanner sc = new Scanner(System.in); System.out.println("Enter a number and its power:"); n = sc.nextInt(); p =sc.nextInt(); System.out.println(power(n, p)); } public static int power(int n, int p){ if(p == 1){ return n; } return n * power(n, p - 1); } } |
3. Using Math.pow()
It is the simplest and very frequently used way. Math.pow() method takes tow double type arguments. First argument is the number and second is the power.
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package com; import java.util.Scanner; public class PowerOfNumber { public static void main(String args[]) { int n, p; Scanner sc = new Scanner(System.in); System.out.println("Enter a number and its power:"); n = sc.nextInt(); p =sc.nextInt(); System.out.println(Math.pow(n, p)); } } |
4. Using BigInteger.pow()
BigInteger class provides method pow() to raise a number to a power. It can be used in following way.
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import java.math.BigInteger; import java.util.Scanner; public class PowerOfNumber { public static void main(String args[]) { int n, p; Scanner sc = new Scanner(System.in); System.out.println("Enter a number and its power:"); n = sc.nextInt(); p =sc.nextInt(); BigInteger bi = new BigInteger(n + ""); System.out.println(bi.pow(p)); } } |
Comment below if you know any other way to calculate power of number in java.
