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Power of Number in Java

Compute a^b using a loop (similar to earlier power program).

BeginnerModule 3: Loop ProgramsExample 13 of 25

power-of-number.java

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner sc = new Scanner(System.in);
6        System.out.print("Enter base: ");
7        int a = sc.nextInt();
8        System.out.print("Enter exponent: ");
9        int b = sc.nextInt();
10
11        long result = 1;
12        for (int i = 1; i <= b; i++) {
13            result *= a;
14        }
15
16        System.out.println(a + " ^ " + b + " = " + result);
17        sc.close();
18    }
19}

Output

Enter base: 3
Enter exponent: 4
3 ^ 4 = 81

What's going on

Loop multiply, start from 1. Math.pow exists; this is so you see exponentiation is repeated multiply. ^ in Java is XOR. Use the wrong one and you get a mystery integer.

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