Using a switch statement to count letter grades. - CSharp Language Basics

CSharp examples for Language Basics:switch

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Description

Using a switch statement to count letter grades.

Demo Code

using System;// w  w  w .  j a v  a2  s  .  c  om
class GradeBook
{
   static void Main()
   {
      int total = 0; // sum of grades
      int gradeCounter = 0; // number of grades entered
      int aCount = 0; // count of A grades
      int bCount = 0; // count of B grades
      int cCount = 0; // count of C grades
      int dCount = 0; // count of D grades
      int fCount = 0; // count of F grades
      Console.WriteLine("Enter the integer grades in the range 0-100.");
      Console.WriteLine("Type <Ctrl> z and press Enter to terminate input:");
      string input = Console.ReadLine(); // read user input
      while (input != null)
      {
         int grade = int.Parse(input); // read grade off user input
         total += grade; // add grade to total
         ++gradeCounter; // increment number of grades
         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 bCount
            break; // exit switch
            case 7: // grade was between 70 and 79
            ++cCount; // increment cCount
            break; // exit switch
            case 6: // grade was between 60 and 69
            ++dCount; // increment dCount
            break; // exit switch
            default: // grade was less than 60
            ++fCount; // increment fCount
            break; // exit switch
         }
         input = Console.ReadLine(); // read user input
      }
      Console.WriteLine("\nGrade Report:");
      if (gradeCounter != 0)
      {
         // calculate average of all grades entered
         double average = (double)total / gradeCounter;
         Console.WriteLine($"Total of the {gradeCounter} grades entered is {total}");
         Console.WriteLine($"Class average is {average:F}");
         Console.WriteLine("Number of students who received each grade:");
         Console.WriteLine($"A: {aCount}"); // display number of A grades
         Console.WriteLine($"B: {bCount}"); // display number of B grades
         Console.WriteLine($"C: {cCount}"); // display number of C grades
         Console.WriteLine($"D: {dCount}"); // display number of D grades
         Console.WriteLine($"F: {fCount}"); // display number of F grades
      }
      else // no grades were entered, so output appropriate message
      {
         Console.WriteLine("No grades were entered");
      }
   }
}

Result


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