//引入命名空间
using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      // Organization of runningBacks 5-tuple:
      //    Component 1: Player name
      //    Component 2: Number of games played
      //    Component 3: Number of attempts (carries)
      //    Component 4: Number of yards gained 
      //    Component 5: Number of touchdowns   
      Tuple<string, int, int, int, int>[] runningBacks =
           { Tuple.Create("Payton, Walter", 190, 3838, 16726, 110),  
             Tuple.Create("Sanders, Barry", 153, 3062, 15269, 99),            
             Tuple.Create("Brown, Jim", 118, 2359, 12312, 106),            
             Tuple.Create("Dickerson, Eric", 144, 2996, 13259, 90),            
             Tuple.Create("Faulk, Marshall", 176, 2836, 12279, 100) }; 
      // Calculate statistics.
      // Organization of runningStats 5-tuple:
      //    Component 1: Player name
      //    Component 2: Number of attempts per game
      //    Component 3: Number of yards per game
      //    Component 4: Number of yards per attempt 
      //    Component 5: Number of touchdowns per attempt   
      Tuple<string, double, double, double, double>[] runningStats  = 
          ComputeStatistics(runningBacks);

      // Display the result.          
      Console.WriteLine("{0,-16} {1,5} {2,6} {3,7} {4,7} {5,7} {6,7} {7,5} {8,7}\n", 
                        "Name", "Games", "Att", "Att/Gm", "Yards", "Yds/Gm",
                        "Yds/Att", "TD", "TD/Att");
      for (int ctr = 0; ctr < runningBacks.Length; ctr++)
         Console.WriteLine("{0,-16} {1,5} {2,6:N0} {3,7:N1} {4,7:N0} {5,7:N1} {6,7:N2} {7,5} {8,7:N3}\n", 
                           runningBacks[ctr].Item1, runningBacks[ctr].Item2, runningBacks[ctr].Item3, 
                           runningStats[ctr].Item2, runningBacks[ctr].Item4, runningStats[ctr].Item3, 
                           runningStats[ctr].Item4, runningBacks[ctr].Item5, runningStats[ctr].Item5);
   }

   private static Tuple<string, double, double, double, double>[] ComputeStatistics(
                Tuple<string, int, int, int, int>[] players) 
   {
      Tuple<string, double, double, double, double> result; 
      var list = new List<Tuple<string, double, double, double, double>>();
      
      foreach (var player in players)
      {
         // Create result object containing player name and statistics.
         result = Tuple.Create(player.Item1,  
                               player.Item3/((double)player.Item2), 
                               player.Item4/((double)player.Item2),
                               player.Item4/((double)player.Item3), 
                               player.Item5/((double)player.Item3));
         list.Add(result);         
      }
      return list.ToArray();  
   }
}