1. Introduction

In this blog post, we will write a Java program to calculate the power of a number. This operation is represented as base^exponent. For instance, 2^3 would be 2 multiplied by itself twice, which equals 8.

2. Program Steps

1. Import the Scanner class from the java.util package for user input.

2. Define the main class named PowerCalculator.

3. Inside the main class, define the main method.

4. Inside the main method, create an object of the Scanner class for user input.

5. Prompt the user to enter the base and the exponent.

6. Calculate the result by using the Math.pow method.

7. Print the calculated power of the number.

3. Code Program

import java.util.Scanner; // 1. Importing Scanner for user input

public class PowerCalculator { // 2. Defining the main class

    public static void main(String[] args) { // 3. Defining the main method

        Scanner input = new Scanner(System.in); // 4. Creating Scanner object for user input

        System.out.print("Enter the base: "); // 5. Prompting user to enter the base
        double base = input.nextDouble(); // Receiving the base

        System.out.print("Enter the exponent: "); // 5. Prompting user to enter the exponent
        double exponent = input.nextDouble(); // Receiving the exponent

        double result = Math.pow(base, exponent); // 6. Calculating power using Math.pow method

        System.out.println(base + " raised to the power of " + exponent + " is: " + result); // 7. Printing the result

        input.close(); // Closing the Scanner object to avoid memory leak
    }
}

Output:

Enter the base: 3
Enter the exponent: 4
3.0 raised to the power of 4.0 is: 81.0

4. Step By Step Explanation

– Step 1: The Scanner class from the java.util package is imported to facilitate user input.

– Step 2: The main class named PowerCalculator is defined.

– Step 3: The main method, which is the entry point of the program, is defined inside the main class.

– Step 4: A Scanner object named "input" is created to take user input.

– Step 5: The user is prompted to enter the base and the exponent. For this example, the user enters 3 for the base and 4 for the exponent.

– Step 6: The program then calculates the result by using the Math.pow method, which takes the base and the exponent as parameters and returns the power of the number.

– Step 7: Finally, the program prints out the result, showing that 3.0 raised to the power of 4.0 is 81.0.

– Lastly, the Scanner object is closed to avoid any potential memory leak.