Question

Create a new NetBeans project called PS1Gradebook. Your program will simulate the design of a student gradebook using a two-dimensional array. It should allow the user to enter the number of students and the number of assignments they wish to enter grades for. This input should be used in defining the two-dimensional array for your program. For example, if I say I want to enter grades for 4 students and 5 assignments, your program should define a 4 X 5 array. Your program should allow the user to then enter the appropriate number of grades and store them within the two dimensional array. Your program should include an additional method that will display these values in a matrix form, with the student names on the left and the assignment names as the column header. After displaying the matrix, add a second method that will display each student’s grade average. Your programs output should be appropriately formatted and look like the following: Note: Your output will vary based off the dimensions of the array.

Answer 1

import java.util.Scanner;
//class PS1Gradebook
public class PS1Gradebook {
  
  
   //method to show student data in matrix
   public static void showData(int [][]studentData, String[] studentNames) {
      
       System.out.println("Student Data: ");
      
       for(int i = 0 ; i < studentData.length ; i ++) {
           //adding \t for data formatting
           System.out.print(studentNames[i] + " ==>\t\t");
           for (int j = 0 ; j < studentData[i].length ; j ++) {
               System.out.print(studentData[i][j] +"\t\t ");
           }
           System.out.println();
       }
   }
  
   //method to calculate the average grade
   public static void showAverage(int [][] studentData, String[] studentNames) {
      
       System.out.println("\n\n-----Avgerage-----");
       for(int i = 0 ; i < studentData.length ; i ++) {
           int sum = 0;
           System.out.print(studentNames[i] + " ==> ");
           for (int j = 0 ; j < studentData[i].length ; j ++) {
               sum += studentData[i][j];
           }
           System.out.println("\t\t"+sum/studentData[i].length);
       }
   }

  
   public static void main(String[] args) {
       int numberOfStudents = 0;
   int numberOfAssignments = 0;

       //scanner object to read user input
   Scanner sc = new Scanner(System.in);
  
   //readng number of students and number of assignments
   System.out.print("Enter Number of student: ");
   numberOfStudents = sc.nextInt();

   System.out.print("Enter Number of assignments: ");
   numberOfAssignments = sc.nextInt();
  
  
   //declaring array
   int studentData [][] = new int[numberOfStudents][numberOfAssignments];

   String[] studentNames = new String[numberOfStudents];

   System.out.println("Enter The Student Data: ");
  
   //populating the 2d array.
   for(int i = 0 ; i < numberOfStudents ; i ++)
   {
   System.out.print("Name: ");
   studentNames[i] = sc.next();
  
   System.out.println("Enter Grades: ");
   for(int j = 0 ; j < numberOfAssignments ; j ++)
   {
   studentData[i][j] = sc.nextInt();
   }
   sc.nextLine();
   }
  
   showData(studentData, studentNames);
   showAverage(studentData, studentNames);
  
   sc.close();
   }

}

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