gistfile1.cs

using System;

namespace floor
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Random r = new Random ();

			double floorMillis = 0;
			double truncMillis = 0;
			double floorMin = double.MaxValue;
			double floorMax = 0;
			double truncMin = double.MaxValue;
			double truncMax = 0;

			for (int k = 0; k < 1000; k++) {
				Console.WriteLine(k);
				DateTime start = DateTime.Now;
				for (int i = 0; i < 50000; i++) {
					int whole = r.Next (5000);
					double dec = r.NextDouble ();
					decimal d = whole + (decimal)dec;
					Math.Truncate (d);
				}
		
				TimeSpan truncEnd = DateTime.Now - start;
				truncMillis += truncEnd.TotalMilliseconds;
				truncMax = (truncMax < truncEnd.TotalMilliseconds ? truncEnd.TotalMilliseconds : truncMax);
				truncMin = (truncMin > truncEnd.TotalMilliseconds ? truncEnd.TotalMilliseconds : truncMin);

				start = DateTime.Now;
				for (int i = 0; i < 50000; i++) {
					int whole = r.Next (5000);
					double dec = r.NextDouble ();
					decimal d = whole + (decimal)dec;
					Math.Floor (d);
				}

				TimeSpan floorEnd = DateTime.Now - start;
				floorMillis += floorEnd.TotalMilliseconds;
				floorMax = (floorMax < floorEnd.TotalMilliseconds ? floorEnd.TotalMilliseconds : floorMax);
				floorMin = (floorMin > floorEnd.TotalMilliseconds ? floorEnd.TotalMilliseconds : floorMin);
			}

			Console.WriteLine("Average for 50000 truncations in ms: " + truncMillis/1000);
			Console.WriteLine("Trunc max: " + truncMax + "\tTrunc min: " + truncMin);

			Console.WriteLine("\nAverage for 50000 floors in ms: " + floorMillis/1000);
			Console.WriteLine("Floor max: " + floorMax + "\tFloor min: " + floorMin);
		}
	}
}






----- Time taken with decimal.Parse
Average for 50000 truncations in ms: 141.02773
Trunc max: 199.25	Trunc min: 77.809

Average for 50000 floors in ms: 143.033939
Floor max: 201.471	Floor min: 77.31
 


------ Time taken with cast
Average for 50000 truncations in ms: 154.93566
Trunc max: 222.129	Trunc min: 121.525

Average for 50000 floors in ms: 151.330833
Floor max: 227.499	Floor min: 120.121