Doubling Test.java in programe

DoublingTest.java

public class DoublingTest

{

            public static double timeTrial(int N)

{

        int[] a = new int[N];

        for (int i = 0; i < N; i++)

       {

            a[i] = StdRandom.uniform(2000000) - 1000000;

        }

        Stopwatch s = new Stopwatch();

        int cnt = ThreeSum.count(a);

        return s.elapsedTime();

    }

                public static void main(String[] args)

                 {

        StdOut.printf("%7s %7s %4s\n", "size", "time", "ratio");

        double prev = timeTrial(256);

        for (int N = 512; true; N += N)

        {

            double curr = timeTrial(N);

            StdOut.printf("%7d %7.2f %4.2f\n", N, curr, curr / prev);

            prev = curr;

        }

    }

}