Question

Java Programing Code only

Ragged Array Assignment

Outcome:

• Student will demonstrate the ability to create and use a 2D array
• Student will demonstrate the ability to create and use a jagged array
• Student will demonstrate the ability to design a menu system
• Student will demonstrate the ability to think

Program Specifications:

Write a program that does the following:

1. Uses a menu system
2. Creates an array with less than 25 rows and greater than 5 rows and an unknown number of columns
3. You can assume that the row index represents one individual student
4. Each column represents an exam score for that individual student (the number of exams will vary by student)
5. Enter at least 10 students along with a varying number of exam scores for each different student.
6. Display the Average for all exams by each Student Id
7. Display the Average for each exam by Exam Number
8. Display the class average
9. Everything needs to be a written in Static Method

The menu system will have an option to input grades for the next student. Once pressed the user will then enter how many exams that student has taken. The program will then ask the user to enter each of those exam scores.

Menu will have an option to display the exam average by student.

Menu will have an option to display the exam average by exam.

Menu will have an option to display the current class average for all exams.

Submission Requirements:

• You must follow the rules from the second assignment.

YOU CANNOT:

• Use global variables
• Use the word goto
• Use the break command outside a case statement

Answer 1

please do upvote .If you have any problem do comment and i shall be happy to help you.Thanks for using HomeworkLib.

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import java.util.Arrays;
import java.util.Scanner;

public class Menu
{
  
   public static void main(String args[])
   {
      
       //variables
       int maxNumberOfStudents=15;
       int countOfStudents=0;
       int highestCol=0;
      
       double sum=0;
       double avg=0;
       double count=0;
       Scanner read=new Scanner(System.in);
      
      
      
       //jagged array
       int examScores[][] = new int[maxNumberOfStudents][];
       int choice=0;
      
       //keep asking until choice=5
   while(choice!=5)
   {
       printMenu();
      
       System.out.println("Enter choice: ");
       choice=read.nextInt();
      
       switch(choice)
       {
      
       //get details
       case 1:
      
           System.out.println("Enter number of exams given by student: ");
int cols=read.nextInt();
          
if(cols>highestCol)
{
   highestCol=cols;
}
  
examScores[countOfStudents]= new int[cols];
  
for(int c=0;c<cols;c++)
{
  
   System.out.println(String.format("Enter score for exam %d :",c+1));
  
   examScores[countOfStudents][c]=read.nextInt();
}
          
           countOfStudents++;

           break;
          
          
       case 2:
          
           //calculate average by students and display it
          
           System.out.println("Enter student id: ");
       int id=read.nextInt();
               int i=id-1;
              
               count=0;
               sum=0;
               for(int c=0;c<examScores[i].length;c++)
               {
                  
                   sum=sum+examScores[i][c];
                  
                  
               }
              
               avg=sum/examScores[i].length;
              
              
               System.out.println(String.format("average of student %d is %f",id,avg));
          
          
          
           break;
          
          
       case 3:
          
          
          
           System.out.println("Enter exam number: ");
       int number=read.nextInt();
           int examIndex=number-1;
               count=0;
               sum=0;
               for(int r=0;r<countOfStudents;r++)
               {
                  
                   try
                   {
                       sum=sum+examScores[r][examIndex];
                       count++;
                      
                      
                   }
                   //catch index out of bounds exception when student r not have scores for exam c
                   catch(Exception e)
                   {
                      
                   }
              
              
               }
               avg=sum/count;
              
               System.out.println(String.format("average of exam no %d is %f",number,avg));
          
           break;
          
          
       case 4:
          

           for(int c=0;c<highestCol;c++)
           {
               count=0;
               sum=0;
               for(int r=0;r<countOfStudents;r++)
               {
                  
                   try
                   {
                       sum=sum+examScores[r][c];
                       count++;
                      
                      
                   }
                   //catch index out of bounds exception when student r not have scores for exam c
                   catch(Exception e)
                   {
                      
                   }
               }
              
              
               avg=sum/count;
              
               System.out.println(String.format("average of exam no %d is %f",c+1,avg));
           }
           break;
          
          
       }
   }
   }

   private static void printMenu() {
       // TODO Auto-generated method stub
       System.out.println("1. input grades for next student");
       System.out.println("2. display the exam average by student.");
       System.out.println("3. display the exam average by exam.");
       System.out.println("4. display the current class average for all exams.");
       System.out.println("5. quit");

      
   }
  
}

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