//This is my solution, use in case to need protected long power(int n, int p) throws Exception{ double result = 0; if(n == 0 && p == 0){ throw new Exception("n and p should not be zero."); }else if( n < 0 || p < 0){ throw new Exception("n or p should not be negative."); } result = Math.pow(n,p); long casting = (long) result; return casting; }

class MyCalculator { public int power(int n, int p) throws Exception { if (n == 0 && p == 0) { throw new Exception("n and p should not be zero."); } else if (n < 0 || p < 0) { throw new Exception("n or p should not be negative."); } int number=1; for(int i=1;i<=p;i++){ number*=n; } return number; } }

class MyCalculator{ /* * Create the method long power(int, int) here. */

    public long power(final int n, final int p) throws Exception {
    if (n < 0 || p < 0) {
        throw new Exception("n or p should not be negative.");
    } else if (n == 0 && p == 0) {
        throw new Exception("n and p should not be zero.");
    }
    return (long)Math.pow(n, p);

} }

My Code without Math.pow() function

import java.util.Scanner;

class MyCalculator {
    public long power(int n, int p) throws Exception {
        if (n == 0 && p == 0) {
            throw new Exception("n and p should not be zero.");
        } else if (n < 0 || p < 0) {
            throw new Exception("n or p should not be negative.");
        } else {
            long temp = 1;
            int count = 1;
            while (count <= p) {
                temp = temp * n;
                count++;
            }
            return temp;
        }

    }
}

public class Solution {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        MyCalculator myCalculator = new MyCalculator();
        while (s.hasNextInt()) {
            int n = s.nextInt();
            int p = s.nextInt();
            try {
                System.out.println(myCalculator.power(n, p));
            } catch (Exception e) {
                System.out.println(e);
            }
        }
    }
}

public int power(int n, int p) throws Exception {
    if (n == 0 && p == 0) {
         throw new Exception("n and p should not be zero.");
    } else if (n < 0 || p < 0) {
        throw new Exception("n or p should not be negative.");
    }

    return (int) Math.pow(n, p);
}