1 // Student: Pat Moss www.patmoss.com/cis162ad/
  2 // Instructor: Dave Hammer http://members.cox.net/dwhammer/
  3 
  4 // CIS162AD -- C Sharp (C#) -- Section 5832
  5 // Professor: Dave Hammer  dwhammer@cox.net
  6 // http://members.cox.net/dwhammer/
  7 // Student:   Patrick Moss patmoss@patmoss.com
  8 // http://www.patmoss.com/cis162ad/
  9 
 10 // Worksheet #4
 11 // III. Programming Exercise
 12 // Write a program to calculate the average of all scores entered
 13 // between 0 and 100. Use a sentinel-controlled loop variable to
 14 // terminate the loop. After values are entered and average
 15 // calculated, test the average to determine whether an A, B, C,
 16 // D, or F should be recorded. The scoring rubric is as follows:
 17 // A: 90 to 100, B: 80 to 89, C: 70 to 79, D: 60 to 69, F: less
 18 // than 60. Turn in your source code for this program.
 19 
 20 // program name: calcaverage.cs  rev. 01  02-25-2006  by pat moss
 21 // textbook: Visual C# .NET Programming, Barbara Doyle, 0619159979
 22 
 23 using System;
 24 
 25 namespace calcaverage
 26 {
 27   class calcaverage
 28   {
 29     static void Main()
 30     {
 31       bool moreToDo = true;
 32       double examScore = 0.0;
 33       int examCount = 0;
 34       double examSum = 0.0;
 35       double examAverage = 0.0;
 36       int examAverage1 = 0;
 37       char examGrade = ' ';
 38 
 39       Console.WriteLine("Worksheet4 -- calcaverage.cs");
 40       Console.WriteLine("Student: Pat Moss");
 41       Console.WriteLine("Instructor: Dave Hammer");
 42 
 43       displayInstructions();
 44 
 45       do
 46       {
 47        Console.Write("Enter the next Exam score: ");
 48        examScore = Convert.ToDouble(Console.ReadLine());
 49 
 50        // test for a negative sentinel exit value present
 51        if (examScore < 0.0)
 52         moreToDo = false;  // yes -- exit from the loop now
 53        else if (examScore > 100.0) // no -- test for invalid Exam score present
 54        Console.WriteLine("**Error: Invalid Exam Score: {0}", examScore);
 55        else                // value is ok, so process the current Exam score
 56        {
 57         examCount++;
 58         examSum += examScore;
 59        }
 60       } while (moreToDo == true);
 61 
 62       // calculate the average of all Exam scores
 63       // and round to two decimal places
 64       examAverage = Math.Round((examSum / (double) examCount), 2);
 65 
 66       // determine a letter grade for the Exam score average
 67       // where A = 90-100, B = 80-89, C = 70-79, D = 60-69,
 68       // and   F = 0-59
 69       examAverage1 = (int) (examAverage / 10.0);
 70       switch (examAverage1)
 71       {
 72        case 9:
 73        case 10:
 74         examGrade = 'A';
 75         break;
 76        case 8:
 77         examGrade = 'B';
 78         break;
 79        case 7:
 80         examGrade = 'C';
 81         break;
 82        case 6:
 83         examGrade = 'D';
 84         break;
 85        default:
 86         examGrade = 'F';
 87         break;
 88       }
 89 
 90       Console.WriteLine(" ");
 91       Console.WriteLine("Number of exams:  {0}", examCount);
 92       Console.WriteLine("Sum of exams:     {0:F2}", examSum);
 93       Console.WriteLine("Average of exams: {0:F2}", examAverage);
 94       Console.WriteLine("Letter grade:     {0}", examGrade);
 95 
 96       Console.WriteLine("\nAll done...");
 97     }
 98 
 99     private static void displayInstructions()
100     {
101      Console.WriteLine("Exam Average and Grade Calculator\n");
102      Console.WriteLine("Enter each Exam Score on a separate line.");
103      Console.WriteLine("Note: Scores are rounded to two decimal places.");
104      Console.WriteLine("Enter a negative value to calculate results...\n");
105     }
106   }
107 }
108