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    class MyCalculator{
        public static int power(int n, 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.");
            }
            else {
                return ((int)Math.pow(n,p));
            }
        }
    }