Use switch statement to count letter grades. - Java Language Basics

Java examples for Language Basics:switch

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Description

Use switch statement to count letter grades.

Demo Code

import java.util.Scanner; 

public class Main 
{
   public static void main(String[] args)
   {//from w w  w  .jav a 2s  . c o  m
      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             

      Scanner input = new Scanner(System.in);

      System.out.printf("%s%n%s%n   %s%n   %s%n", 
         "Enter the integer grades in the range 0-100.", 
         "Type the end-of-file indicator to terminate input:", 
         "On UNIX/Linux/Mac OS X type <Ctrl> d then press Enter",
         "On Windows type <Ctrl> z then press Enter");

      // loop until user enters the end-of-file indicator
      while (input.hasNext()) 
      {
         int grade = input.nextInt(); // read grade
         total += grade; // add grade to total
         ++gradeCounter; // increment number of grades
         
         //  increment appropriate letter-grade counter   
         switch (grade / 10)                            
         {                                                
            case 9:  // grade was between 90              
            case 10: // and 100, inclusive                
               ++aCount;         
               break; // exits switch         
                                                          
            case 8: // grade was between 80 and 89        
               ++bCount;            
               break; // exits switch                      
                                                          
            case 7: // grade was between 70 and 79        
               ++cCount;            
               break; // exits switch                      
                                                          
            case 6: // grade was between 60 and 69        
               ++dCount;             
               break; // exits switch                      
                                                          
            default: // grade was less than 60            
               ++fCount;              
               break; // optional; exits switch anyway
         } // end switch                                  
      } // end while 

      // display grade report
      System.out.printf("%nGrade Report:%n");

      // if user entered at least one grade...
      if (gradeCounter != 0) 
      {
         // calculate average of all grades entered
         double average = (double) total / gradeCounter;  

         // output summary of results
         System.out.printf("Total of the %d grades entered is %d%n", 
            gradeCounter, total);
         System.out.printf("Class average is %.2f%n", average);
         System.out.printf("%n%s%n%s%d%n%s%d%n%s%d%n%s%d%n%s%d%n", 
            "Number of students who received each grade:", 
            "A: ", aCount,   // display number of A grades
            "B: ", bCount,   // display number of B grades
            "C: ", cCount,   // display number of C grades 
            "D: ", dCount,   // display number of D grades
            "F: ", fCount); // display number of F grades
      }
      else 
         System.out.println("No grades were entered");
   } 
}

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