Question

You are to write a program which will ask the user for number of students (dynamic array of class Student).

For each student, you will ask for first name and number of grades (dynamic array of grades as a variable in Student).

**The program should give the student random grades from 0-100**

Find the averages of each student and display the information.

**Display name, grades, and average neatly in a function in the Student class called Display()**

Sort the students by average (least to greatest) using Bubble Sort OR Selection Sort.

Look at notes to help with the assignment.

Answer 1

ANSWER:

GIVEN THAT:

Student.java

import java.util.Arrays;

public class Student {
  
  
   String firstName;
   double[] grades;
  
   public Student() {
   }
  
   public Student(String firstName, double[] grades) {
      
       this.firstName= firstName;
       this.grades = grades;
  
}

   public String getFirstName() {
       return firstName;
   }

   public void setFirstName(String firstName) {
       this.firstName = firstName;
   }

   public double[] getGrades() {
       return grades;
   }

   public void setGrades(double[] grades) {
       this.grades = grades;
   }
  
  
   public double average() {
      
       double sum=0;
       int len = grades.length;
      
       for(int i=0;i<len;i++) {
           sum=sum+grades[i];
       }
      
       return sum/len;
   }
  
  
   public void display() {
      
       System.out.println("Student Name : "+this.firstName);
       System.out.println("Grades are : "+Arrays.toString(grades));
       System.out.println("Average is : "+average());
   }
  
}

StudentTester.java

import java.util.Scanner;

public class StudentTester {

   public static void main(String[] args) {
       // TODO Auto-generated method stub

       String name;
       double[] grades;
       int studentNum;
       int gradeNum;
       Scanner scan = new Scanner(System.in);
      
       System.out.println("Enter number of students you will enter : ");
       studentNum=scan.nextInt();
       Student[] students = new Student[studentNum];
      
       for(int i=0;i<studentNum;i++) {
      
           System.out.println("Entering student number " + (i+1));
           System.out.println("Enter the student Name : ");
           name=scan.next();
          
           System.out.println("Enter number of grades : ");
           gradeNum=scan.nextInt();
          
          
           grades = new double[gradeNum];
          
           System.out.println("Enter the grades one by one");
           for(int j=0; j<gradeNum;j++)
               grades[j]=scan.nextDouble();
          
           students[i]=new Student(name,grades);
          
       }
       System.out.println("Displaying students Information before sorting : ");
       for(int i=0;i<studentNum;i++)
           students[i].display();
      
       for (int i = 0; i < studentNum-1; i++)
for (int j = 0; j < studentNum-i-1; j++)
if (students[j].average() > students[j+1].average())
{
  
Student temp = students[j];
students[j] = students[j+1];
students[j+1] = temp;
}
      
       System.out.println("Displaying students Information After sorting : ");
       for(int i=0;i<studentNum;i++)
           students[i].display();
   }

}