In this article, we will show you, How to write a Java Program to find Power of a Number using For Loop, and While Loop. You can also use math.pow function to achieve the same.

## Java Program to find Power of a Number Using For Loop

This program allows the user to enter Number, and an exponent value. Using these values, this program will calculate the Power of a given number using For Loop.

// Java Program to find Power of a Number import java.util.Scanner; public class PowerofaNumber { private static Scanner sc; public static void main(String[] args) { int number, i, exponent; long power = 1; sc = new Scanner(System.in); System.out.print(" Please Enter any Number : "); number = sc.nextInt(); System.out.print(" Please Enter the Exponent Value : "); exponent = sc.nextInt(); for(i = 1; i <= exponent; i++) { power = power * number; } System.out.println("\n The Final result of " + number + " power " + exponent + " = " + power); } }

**OUTPUT**

**ANALYSIS**

We initialized the integer i value to 1 and also (i <= exponent) condition will help the loop to terminate when the condition fails.

for(i = 1; i <= exponent; i++) { power = power * number; }

User entered values in the above example are: number = 5, and exponent = 3

**First Iteration: for(i = 1; i <= 3; i++)**

It means condition inside the For loop (1 <= 3) is True

power = 1 * 5 = 5

i++ means i will become 2

**Second Iteration: for(i = 2; i <= 3; i++)**

It means condition inside the For loop (2 <= 3) is True

power = 5 * 5 = 25

i++ means i will become 3

**Third Iteration: for(i = 3; 3 <= 3; i++)**

power = 5 * 25 = 125

i++ means i will become 4

**Fourth Iteration: for(i = 4; i <= 3; i++)**

It means condition inside the For loop (4 <= 3) is False. So, compiler will come out of the For Loop and prints the output.

## Java Program to find Power of a Number Using While Loop

This program will calculate the power of any given number using While Loop.

/* C Program to find Power of a Number using While Loop */ #include <stdio.h> int main() { int i = 1, Number, Exponent; long Power = 1; printf("\n Please Enter any Number : "); scanf(" %d", &Number); printf("\n Please Enter the Exponent Vlaue: "); scanf(" %d", &Exponent); while(i <= Exponent) { Power = Power * Number; i++; } printf("\n The Final result of %d Power %d = %ld", Number, Exponent, Power); return 0; }

We just replaced the For loop in the above example with the While loop. If you don’t understand the While Loop, please refer While Loop article here: WHILE LOOP

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