/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//
// CalcPi.cs -- Estimates pi by throwing points into a square. Use to
// compare execution times.
//
// Compile this program with the following command line:
// C:>csc CalcPi.cs
//
namespace CalcPi
{
using System;
public class CalcPi
{
static void Main ()
{
const int throws = 10000000;
DateTime now = DateTime.Now;
Random rand = new Random ((int) now.Millisecond);
int Inside = 0;
for (int i = 0; i < throws; ++i)
{
double cx = rand.NextDouble();
double cy = rand.NextDouble();
double distance = Math.Sqrt ((cx * cx) + (cy * cy));
if (distance < 1.0)
++Inside;
}
double pi = 4 * (double) Inside / (double) throws;
DateTime End = DateTime.Now;
TimeSpan Diff = End - now;
Console.WriteLine ("pi = " + pi);
Console.WriteLine ("Milliseconds = " + Diff.TotalMilliseconds);
}
}
}