Java Program to Calculate the Power of a Number

In this post Java Program to Calculate the Power of a Number you will learn how to find the power of a number with and without using pow() function.

Approach 1:

Here, either we can use while loop or for loop. We have core logic is that after each iteration exponent is decremented by 1 and result is multiplied by base exponent number of times.

package com.kkjavatutorials.clients;

import java.util.Scanner;
/**
 * @author KK JavaTutorials
 *This java Program is all about How to Calculate the Power of a Number
 */
public class CalculatePowerOfNumberTest1 {

	public static void main(String[] args) {
		Scanner  scanner = null;
		try {
			//Take base and  exponent number from keyboard using Scanner
			scanner = new Scanner(System.in);
			System.out.println("Enter base Number:");
			//Take either zero,positive or negative base number
			int base = scanner.nextInt();
			//Take either zero or positive exponent number
			System.out.println("Enter exponent Number:");
			int exponent = scanner.nextInt();
			int exp =exponent;
			
			long result = 1;
			for (;exponent != 0; --exponent){
	            result *= base;
	        }
			System.out.println(base+" to power "+exp+" is:" + result);
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if(scanner != null)
				scanner.close();
		}
	}
}

package com.kkjavatutorials.clients;

import java.util.Scanner;

/**

* @author KK JavaTutorials

*This java Program is all about How to Calculate the Power of a Number

public class CalculatePowerOfNumberTest1 {

public static void main(String[] args) {

Scanner scanner = null;

try {

//Take base and exponent number from keyboard using Scanner

scanner = new Scanner(System.in);

System.out.println("Enter base Number:");

//Take either zero,positive or negative base number

int base = scanner.nextInt();

//Take either zero or positive exponent number

System.out.println("Enter exponent Number:");

int exponent = scanner.nextInt();

int exp =exponent;

long result = 1;

for (;exponent != 0; --exponent){

result *= base;

}

System.out.println(base+" to power "+exp+" is:" + result);

} catch (Exception e) {

e.printStackTrace();

}finally {

if(scanner != null)

scanner.close();

}

I have tested above programs for few inputs as below. You may test for other input as well

Enter base Number:
5
Enter exponent Number:
3
5 to power 3 is:125
-------------------------------------------------------------------------------------------------
Enter base Number:
-4
Enter exponent Number:
3
-4 to power 3 is:-64
-------------------------------------------------------------------------------------------------
Enter base Number:
0
Enter exponent Number:
2
0 to power 2 is:0
-------------------------------------------------------------------------------------------------
Enter base Number:
10
Enter exponent Number:
0
10 to power 0 is:1

Enter base Number:

Enter exponent Number:

5 to power 3 is:125

-------------------------------------------------------------------------------------------------

Enter base Number:

-4

Enter exponent Number:

-4 to power 3 is:-64

-------------------------------------------------------------------------------------------------

Enter base Number:

Enter exponent Number:

0 to power 2 is:0

-------------------------------------------------------------------------------------------------

Enter base Number:

Enter exponent Number:

10 to power 0 is:1

Approach 2:

What we have seen above Approach 1 that will not work if you have a negative exponent. For that, you may to use pow() function in Java standard library.

package com.kkjavatutorials.clients;

import java.util.Scanner;
/**
 * @author KK JavaTutorials
 *This Java Program is all about How to Calculate the Power of a Number using pow()
 * function in Java standard library.
 */
public class CalculatePowerOfNumberTest2 {

	public static void main(String[] args) {
		Scanner  scanner = null;
		try {
			//Take base and  exponent number from keyboard using Scanner
			scanner = new Scanner(System.in);
			System.out.println("Enter base Number:");
			//Take either zero,positive or negative base number
			int base = scanner.nextInt();
			//Take either zero,positive or negative exponent number
			System.out.println("Enter exponent Number:");
			int exponent = scanner.nextInt();
			double result = Math.pow(base, exponent);
			
			System.out.println(base+" to power "+exponent+" is:" + result);
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if(scanner != null)
				scanner.close();
		}
	}
}

package com.kkjavatutorials.clients;

import java.util.Scanner;

/**

* @author KK JavaTutorials

*This Java Program is all about How to Calculate the Power of a Number using pow()

* function in Java standard library.

public class CalculatePowerOfNumberTest2 {

public static void main(String[] args) {

Scanner scanner = null;

try {

//Take base and exponent number from keyboard using Scanner

scanner = new Scanner(System.in);

System.out.println("Enter base Number:");

//Take either zero,positive or negative base number

int base = scanner.nextInt();

//Take either zero,positive or negative exponent number

System.out.println("Enter exponent Number:");

int exponent = scanner.nextInt();

double result = Math.pow(base, exponent);

System.out.println(base+" to power "+exponent+" is:" + result);

} catch (Exception e) {

e.printStackTrace();

}finally {

if(scanner != null)

scanner.close();

}

I have tested above programs for few inputs as below. You may test for other input as well

Enter base Number:
2
Enter exponent Number:
-3
2 to power -3 is:0.125

---------------------------------------------------------------------------
Enter base Number:
20
Enter exponent Number:
3
20 to power 3 is:8000.0

--------------------------------------------------------------------------
Enter base Number:
-6
Enter exponent Number:
3
-6 to power 3 is:-216.0

Enter base Number:

Enter exponent Number:

-3

2 to power -3 is:0.125

---------------------------------------------------------------------------

Enter base Number:

Enter exponent Number:

20 to power 3 is:8000.0

--------------------------------------------------------------------------

Enter base Number:

-6

Enter exponent Number:

-6 to power 3 is:-216.0

That’s all in this post of Java Program to Calculate the Power of a Number

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