Question

This is in Java

1. Create an application called registrar that has the following classes:

a. A student class that minimally stores the following data fields for a student:

 Name

 Student id number

 Number of credits

 Total grade points earned            

And this class should also be provides the following methods:

 A constructor that initializes the name and id fields

 A method that returns the student name field

 A method that returns the student ID field

 Methods to set and retrieve the total number of credits

 Methods to set and retrieve the total number of grade points earned.

 A method that returns the GPA (grade points divided by credits)

b. An instructor class that minimally stores the following data fields for an instructor:

 Name

 Faculty id number

 Department
The following methods should be provided:

 A constructor that initializes the name and id fields

 Methods to set and retrieve the instructor’s department.

c. A course class that minimally stores the following data for a course:

 Name of the course

 Course registration code

 Maximum number of 50 students

 Instructor
 Number of students

 Students registered in the course (array)
The following methods should also be provided

 A constructor that initialize the name, registration code, and maximum number of students

 Methods to set and retrieve the instructor

 A method to search for a student in the course; the search should be based on an ID number.

 A method to add a student to the course.

 A method to remove a student from the course.

Answer 1

import java.util.Scanner;

class Student
{
   String s_name;
   int credit_no;
   int stud_id;
   int grade_points;
   Student()
   {
       System.out.println("Enter Student name:: ");
       Scanner SC=new Scanner(System.in);
       s_name=SC.nextLine();
       System.out.println("Enter Student id:: ");
       stud_id=SC.nextInt;
   }
   String ret_name()
   {
       return name;
   }
   int ret_id()
   {
       return stud_id;
   }
   void set_ret_credits()
   {
       char choice;
       int temp;
       Scanner SC=new Scanner(System.in);
       System.out.println("Do you wish to set value of credit?? (y/n)");
       choice=SC.nextChar();
       if(choice=="y" || choice=='Y')
       {
           System.out.println("Enter credit value:: ")
           temp=SC.nextInt();
           credit_no+=temp;
       }
       System.out.println("Number of Credits" + credit_no);
   }
   void set_ret_grade()
   {
       char choice;
       int temp;
       Scanner SC=new Scanner(System.in);
       System.out.println("Do you wish to set value of grade points?? (y/n)");
       choice=SC.nextChar();
       if(choice=="y" || choice=='Y')
       {
           System.out.println("Enter credit value:: ")
           temp=SC.nextInt();
           grade_points+=temp;
       }
       System.out.println("Number of Grade points" + grade_points);
   }
   float gpa()
   {
       return(grade_points/credit_no);
   }
}
class Instructor
{
   String i_name;
   int faculty_id;
   String dept;
   Instructor()
   {
       System.out.println("Enter Instructor name:: ");
       Scanner SC=new Scanner(System.in);
       i_name=SC.nextLine();
       System.out.println("Enter faculty id:: ");
       faculty_id=SC.nextInt;
   }
   void set_ret_dept()
   {
       char choice;
       Scanner SC=new Scanner(System.in);
       System.out.println("Do you wish to set department? (y/n)");
       choice=SC.nextChar();
       if(choice=="y" || choice=='Y')
       {
           System.out.println("Enter Department:: ")
           dept=SC.nextLine();
       }
       System.out.println("Department name=" + dept);
   }
}
   class Course
   {
       String c_name;
       int reg_code;
       int max_stud;
       Instructor i;
       int stud_no;
       int reg_stud[50];
       Course()
       {
           Scanner SC=new Scanner(System.in);
           System.out.println("Enter number of students registered:: ");
           max_stud=SC.nextInt();
           System.out.println("Enter course name:: ");
           c_name=SC.nextLine();
           System.out.println("Enter registration code:: ");
           reg_code=SC.nextLine;
          
       }
   void set_ret_instructor()
   {
       char choice;
       Scanner SC=new Scanner(System.in);
       i=new Instructor();
       System.out.println("Instructor name=" + i_name);
       System.out.println("Instructor faculty id:: "+ faculty_id );
   }  
   boolean search()
   {
       int search_key;
       System.out.println("Enter registration number of student to search:: ");
       search_key=SC.nextInt();
       for(int i=0;i<max_stud;i++)
           if(search_key==reg_stud[i])
               return true;
       return false;
   }
   void add_stud()
   {
       int stud_new;
       System.out.println("Enter registartion number of new student:: ");
       stud_new=SC.nextInt();
       reg_stud[max_stud]=stud_new;
       max_stud++;
   }
   void remove_stud()
   {
       int rem_stud;
       System.out.println("Enter registration number of student:: ");
       rem_stud=SC.nextInt();
       for(int i=0;i<max_stud;i++)
           if(search_key==reg_stud[i])
               reg_stud[i]=0;
   }
   }
  

Write the testing code appropriately to your needs.

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