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Introduction to Java

Find result of power without Math.pow() - Java Program

Below is a Java program to calculate the power of a number without using Math.pow(), along with sample outputs and a step-by-step explanation.

We will calculate base^exponent using a loop.

import java.util.Scanner;
 
public class PowerWithoutMath {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        // Taking input
        System.out.print("Enter the base number: ");
        double base = sc.nextDouble();
 
        System.out.print("Enter the exponent (non-negative integer): ");
        int exponent = sc.nextInt();
 
        double result = 1;
 
        // Calculating power using loop
        for (int i = 1; i <= exponent; i++) {
            result *= base;  // Multiply base exponent times
        }
 
        // Displaying result
        System.out.println(base + " raised to the power " + exponent + " = " + result);
 
        sc.close();
    }
}
 

 
OUTPUT 1:
Enter the base number: 2
Enter the exponent (non-negative integer): 5
2.0 raised to the power 5 = 32.0

OUTPUT 2:
Enter the base number: 3
Enter the exponent (non-negative integer): 4
3.0 raised to the power 4 = 81.0

Explanation

✅ Step 1: Input

double base = sc.nextDouble();

int exponent = sc.nextInt();

• Base can be a decimal
• Exponent must be a non-negative integer

✅ Step 2: Initialize result

double result = 1;

Start with 1 because multiplying by 1 doesn’t change the value.

✅ Step 3: Multiply in a loop

for (int i = 1; i <= exponent; i++) {

    result *= base;

}

• Loop runs exponent times
• Each iteration multiplies result by base
• After loop: result = base^exponent

✅ Step 4: Display result

System.out.println(base + " raised to the power " + exponent + " = " + result);

Prints the final calculated value.