Good Programming Practices

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Go to the comment Step 16 in Dietlesson.cs, and add the following lines to read the data entered by the user at the command line.

         for (int i = 0; i < args.Length; i++) {
            if ( args[i].ToCharArray()[0] == '-') {
               switch (args[i].ToCharArray()[1]) {
               case 'c':
                  byColumn = true;
                  break;
               case 'i':
                  varType = NumVarType.Int;
                  break;
               default:
                  Usage();
                  return;
               }
            }
            else {
               filename = args[i];
               break;
            }
         }
        
         Data data = new Data(filename);

Go to the comment Step 17 in Dietlesson.cs, and add the following lines to show the user how to use the command correctly (in case of inappropriate input from a user).

   internal static void Usage() {
      System.Console.WriteLine(" ");
      System.Console.WriteLine("usage: Diet [options] <data file>");
      System.Console.WriteLine("options: -c  build model by column");
      System.Console.WriteLine("         -i  use integer variables");
      System.Console.WriteLine(" ");
   }

Go to the comment Step 18 in Dietlesson.cs, and add the following lines to enclose your application in a try and catch statement in case of anomalies during execution.

      }
      catch (ILOG.CONCERT.Exception ex) {
         System.Console.WriteLine("Concert Error: " + ex);
      }
      catch (InputDataReader.InputDataReaderException ex) {
         System.Console.WriteLine("Data Error: " + ex);
      }
      catch (System.IO.IOException ex) {
         System.Console.WriteLine("IO Error: " + ex);
      }
   }