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    public long 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 (long) Math.pow(n, p);
        }
    
    
    
    }