public class Pi {
	public static void main(String[] args) {
		int n = 1000000;
		int count = 0;

		for (int i = 0; i < n; ++i) {
			//random number >= 0.0 and < 1.0
			final double x = Math.random();
			final double y = Math.random();

			final double distance = Math.hypot(x, y);
			//Could also say distance = Math.sqrt(x * x + y * y);

			if (distance < 1) {
				++count;
			}
		}

		final double pi = 4.0 * count / n;
		System.out.println("count = " + count + " out of " + n);
		System.out.println("computed pi = " + pi);
		System.out.println("actual pi = " + Math.PI);
		System.out.println("error = " + Math.abs(Math.PI - pi));
	}
}