//Fig. 6.9: GradeBook.cs

//GradeBook class that uses a switch statement to count letter grades

using System;

public class GradeBook

{

    public static void Main()

    {

    }

        private int total;

        private int gradeCounter;

        private int aCount;

        private int bCount;

        private int cCount;

        private int dCount;

        private int fCount;

        //automatic property CourseName

        public string CourseName { get; set; }

        //constructor that initializes automatic property CourseName;

        //int instance variable are initialized to 0 by default

        public GradeBook( string name )

        {

            CourseName = name; //set sCourseName to name

        }//end constructor

        //display a message to the GradeBook user

        public void DisplayMessage()

        {

            //CourseName gets the name of the course

            Console.WriteLine("Wlecome to the grade boo for\n{0}!\n", CourseName);

        }//end method Display Message

        //input arbitrary number of grades from user

        public void InputGrades()

        {

            int grade; // grade entered by user 

            string input; // text entered by the user

            Console.WriteLine("{0}\n{1}", "Enter the integer grades in the range 0-100.", "Type <Ctrl> z and press Enter to terminate input:");

            input = Console.ReadLine(); //rea user input

            while (input != null)

            {

                grade = Convert.ToInt32(input); //read grade off user input

                total += grade; //add grade to total

                ++gradeCounter; //increment number of grades

                //call method to increment apprpriate counter

                IncrementLetterGradeCounter(grade);

                input = Console.ReadLine();

            }//end while

        } //end method InputGrades

        //add 1 to appropraite counter for specified grade

        private void IncrementLetteGradeCounter(int grade)

        {   

            //determine which grade was entered

            switch (grade / 10)

            {

                case 9: //grade was in the 90s

                case 10: //grade was 100

                    ++aCount;//increment aCount

                    break; //necessary to exit switch

                case 8: //grade was between 80 and 89

                    ++bCount; //increment Count

                    break;//exit switch

                case 7: //grade was in the 70s

                    ++cCount;//increment cCount

                    break;//exit switch

                case 6: //grade was in the 60s

                    ++dCount; //increment dcOUNT

                    break;//exit switch

                default: //grade was less tahn 60

                    ++fCount; //increment fCount

                    break; //exit switch

            }//end switch

        }// end method IncrementLetterGradeCounter

        //display a report based on the grades entered by the user

        public void DisplayGradeReport()

        {

            Console.WriteLine("\nGrade Report:");

            //if user etered at least one grade

            if (gradeCounter !=0)

            {

                //calculate average of all grades entered

                double average = (double) total / gradeCounter;

                //output summary of results

                Console.WriteLine("Total of the {0} grades entered is {1}", gradeCounter, total);

                Console.WriteLine("Class Average is {0}:F}", average);

                Console.WriteLine("{0}A: {1}\nB: {2}\nC: {3}\nD: {4}\nF: {5}", "Number of students who received each grade:\n", aCount, bCount, cCount, dCount, fCount);

            }// end if

            else //no grades were entered so output appropriate message

                Console.WriteLine("No grades were entered");

        }//end method DisplayGradeReport

    }//end class GradeBook

​

//Fig. 6.0: GradeBookTest.cs

//Creat GradeBook object, input grades and display grade report

public class GradeBookTest

{

    public static void Main()

    {

        //create GradeBook myGradeBook and

        //pss course name to constructor

        GradeBook myGradeBook = new GradeBook("CS101 Introduction to C# Programming");

        myGradeBook. DisplayMessage();

        myGradeBook.InputGrades();

        myGradeBook.DisplayGradeReport();

    }//end Main

}//ed class GradeBookTest

​

​