Question

QUESTION Create the required java classes to store the students (id, name), the courses (id, title), the exam type (id, name) and the marks for each student. ► Add the necessary methods to; • Store the marks (%) for each student in the course. Search for a course, calculate the averages and display the course details as shown in the example below. Class: Computer Engineering Course Id:222 Course title: DataStructure Student Id Student Name Mid-Term Quiz (10%) Homework (10%) Project (10%) Final (70%) Average 1%) (20%) (C) 77.4 70 201920001 Ahmed 67 80 201920002 Salah 201920003 Talal 40 60 201920004 Walid 60 65 90 1 **************************************************************Course average: 70 90 70 55 83 73 To calculate the average for each student follow the formula (10*(( A+B+C)/3)+20*D+70*E)/100 The course average is the total averages divided by the number of students Example: (77.4+75+55+83)/4 Exam type: Quiz, Homework....etc. .

Answer 1

/* package whatever;*/

import java.util.*;
import java.lang.*;
import java.io.*;

//create class to store details of student
class Student
{
   int std_id;   //student id
   String std_name;   //student name
   int c_id;   //course id
   String c_name;   //course name
   int exam_id;   //exam id
   String[] exam_name = new String[5];       //string aray to store 5 type of exam
   int[] marks = new int[5];       //Array to store marks for each exam type
   float avg;   //To store average
  
  
   Student(int st_id, String s_name, int crs_id, String crs_name)
   {
   std_id = st_id;
       std_name = s_name;
       c_id = crs_id;
       c_name = crs_name;
      
       //Exam is same for all students
       exam_name[0] = "Quiz";
       exam_name[1] = "Homework";
       exam_name[2] = "Project";
       exam_name[3] = "Mid-Term";
       exam_name[4] = "Final";
   }
   //create methods

   //1) To store marks (in %) for student
   void storeMarks(int m[])
   {
       //copying the marks which has been passing in that function
       for(int i=0;i<5;i++)
           marks[i] = m[i];
   }
  
  
   // 2) To calculate average of each student
   // using formula (10*((A+B+C)/3)+20*D+70*E)/100
  
   void calAvg()
   {
      
       avg = (10*((marks[0]+marks[1]+marks[2])/3) + 20*marks[3] + 70*marks[4])/100;
      
       //display result
       System.out.println(std_id+" \t"+std_name+"\t"+marks[0]+"\t"+marks[1]+"\t"+marks[2]+"\t"+marks[3]+"\t"+marks[4]+"\t"+avg);
   }
}
class Main
{
   public static void main (String[] args) throws java.lang.Exception
   {
       Scanner in = new Scanner(System.in);
       //Create 4 student object
       Student std[] = new Student[4];
      
       //Enter all details of student
      
      
       for(int i=0;i<4;i++)
       {

  int st_id;
String s_name;
int crs_id;
String crs_name;
int m[] = new int[5];

           System.out.println("**Details for student "+(i+1)+"**");
           System.out.println("Enter student id: ");
           st_id = in.nextInt();
           in.nextLine();
           System.out.println("Enter student name: ");
           s_name = in.nextLine();
           System.out.println("Enter student's course id: ");
           crs_id = in.nextInt();
           in.nextLine();
           System.out.println("Enter student's course name: ");
           crs_name = in.nextLine();
          
           System.out.println("Enter student's marks ");
           for(int j=0;j<5;j++)
               m[j] = in.nextInt();
              
           //store
           std[i] = new Student(st_id,s_name,crs_id,crs_name);

   //call method to store marks
       for(int j=0;j<4;j++)
       {
           std[j].storeMarks(m);
       }
          
       }
      
      
       //calculate average and display result
       System.out.println("Student id Student name Quiz Homework Project Mid-Term Final Average");
       System.out.println();
       for(int i=0;i<4;i++)
       {
           std[i].calAvg();
       }
      
       //calculate course average
       float c_avg = 0;
       for(int i=0;i<4;i++)
       c_avg += std[i].avg;
      
       c_avg = c_avg/4;
       System.out.println("******************************************************************Course average "+c_avg);
   }
}

Output

**Details for student 1** Enter student id: 201920001 Enter student name: Ahmed Enter student's course id: 222 Enter student's course name: DataStructure Enter student's marks 80 70 90 67 80 **Details for student 2** Enter student id: 201920002 Enter student name: Salah Enter student's course id: 222 Enter student's course name: DataStructure Enter student's marks 90 70 80 90 70 **Details for student 3** Enter student id: 201920003 Enter student name: Talal Enter student's course id: 222

DataStructure Enter student's marks 20 70 50 40 60 **Details for student 4** Enter student id: 201920004 Enter student name: wahid Enter student's course id: 222 Enter student's course name: DataStructure Enter student's marks 90 70 60 65 90 Student id Student name Quiz Mid-Term Final Average Homework Project Ahmed 90 70 90 8 201920001 3.0 201920002 3.0 201920003 3.0 201920004 3.0 Salah Talal 90 90 70 70 60 65 60 65 6065 908 wahid 90 70 90 8 ** ** * * * * * * * * *** ******Course average 83.0