Question

Lab Assignment 1

2020 – 2021 Fall, CMPE 211 Fundamentals of Programming II

STUDENT AFFAIRS

DUE DATE: 14.10.2020 – 23:59

In this lab, we will create a model course registration application. Please check out the example run of the program first.

You are asked to implement the classes;

• Student.

• Course.

• Grade.

• StudentAffairs. It will contain the main method.

The commands and their arguments for this week are:

• createCourse <courseCode> <capacity> <day> <studentCount> <averageGrade>

• createStudent <studentName> <studentID>

• addGradeStudent <studentID> <letterGrade>

• addGradeCourse <courseCode> <grade>

• removeGradeStudent <studentID> <letterGrade>

• removeGradeCourse <courseCode> <grade>

• averageGradeStudent <studentID>

• averageGradeCourse <courseCode>

• printGradesStudent <studentID>

• Q

where letterGrade can be (AA, BA, BB, CB, CC, DC, DD, F, FX).

In order to store the students and the courses, create 2 Arrays for them in the StudentAffairs class. You need to take commands from user until you see the “Q” command. For this purpose, you need to create while loop. Stopping condition of this command is “Q” command from user. Each command needs to be differentiated either if clause or switch case. After each command differentiated, specific information subcommands will be taken that belongs the specific main command parsed with space. Each command has specific things to do and command line output that will inform the user. Look at the demo video for better understanding. However, at first you need to create Student, Course and Grade classes.

Grade Class

Data Declarations:

• double grade Methods:
• Constructor : Constructor gets the letter grade and converts it to number representation with the method called convertLetter than holds that value within the grade variable.
• double convertLetter (String letterGrade) : Gets letter grade and returns numeric version of it. (AA=4.0, BA=3.5, BB=3.0, CB=2.5, CC=2.0, DC=1.5, DD=1.0, F=0, FX=0)

• Create Getters and Setters.

Student Class

Data Declarations:

• Grade[] Grades : Holds the Grades of the Student.

• String Name, String StudentID, int GradeCount Methods:
• Constructor : Constructor gets the name of the student and the student ID. Grade array should be initialized here as well (array size is 4). GradeCount is 0 initially.

• boolean addGrade (String letterGrade) : Adding a grade to the Grade array. Returns false if the gradeCount equals to the array size. Increase gradeCount if the grade succesfully added to the array and method should returns true.
• boolean removeGrade (int index) : Remove a grade from the Grade array with given specific index. Returns false if the gradeCount equals to the 0. Decrease gradeCount if the grade successfully removed from the array and method should returns true. Don’t forget to be shifting array after deleting element.
• String printGrades() : Returns all grades of student.

• double averageGrade() : Returns average grades of student.

• String toString( ) : The format is “<name>(<ID>)”.

• Create Getters and Setters.

Course Class

Data Declarations:

• String CourseCode, day

• int studentCount, Capacity

• double averageGrade Methods:
• Constructor : Gets all of the data declarations.

• boolean addGrade (double grade) : Adding a grade to the course. That means student count needs to increase by one. And average grade needs to be calculated. Return false if the capacity reached.
• boolean removeGrade (double grade) : Removing a grade from the course. That means student count needs to decrease by one. And average grade needs to be calculated. Return false if the student count is already 0.

• String toString( ) : The format is “<courseCode>”.

• Create Getters and Setters.

Answer 1

/* package codechef; // don't place package name! */

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

class Student{
Grade[] grades;
String name;
String studentId;
staatic int gradecount = 0;
  
public Sudent(String name,String studentId){
this.name = name;
this.studentId = studentId;
  
this.grades = new Grade[4];
}
  
boolean addGrade(String letterGrade){
if(this.grades < 4){
grades[gradecount] = new Grade(letterGrade);
gradecount++;
return true;
}else{
return flase;
}
}
  
boolean removeGrade(int index){
if(gradecount == 0){
return flase;
}else{
for(int i = 0;i<gradecount-1;i++){
if(i >= index){
Grade temp = this.grades[i];
this.grades[i] = this.grades[i+1];
this.grades[i+1] = temp;
}
}
  
gradecount = gradecount - 1;
}
}
  
String printGrade(){
String send_all = "";
for(int i = 0;i<gradecount;i++){
send_all = send_all + " " + grades[i].grade;
}
  
return send_all;
}
  
double averageGrade(){
double avg = 0;
for(int i = 0;i<gradecount;i++){
avg = avg + grades[i].convertLetter();
}
  
avg = avg/gradecount;
  
return avg;
}
  
String toString(){
return this.name + this.studentId;
}
  
}

class Course{
String CourseCode;
String day;
int StudentCount;
int Capacity;
double averageGrade;
  
public Course(String CourseCode,String day,int StudentCount,int Capacity,doubleAverageGrade){
this.CourseCode = CourseCode;
this.day = day;
this.StudentCount = StudentCount;
this.Capacity = Capacity;
this.averageGrade = averageGrade;
  
}
  
boolean addGrade(double grade){
if(StudentCount > Capacity){
return flase;
}else{
this.averageGrade = (this.averageGrade + grade)/2;
this.StudentCount = this.StudentCount + 1;
  
return true;
}   
}
  
boolean removeGrade(double grade){
if(StudentCount == 0){
return flase;
}else{
this.averageGrade = this.averageGrade - grade;
this.StudentCount = this.StudentCount - 1;
  
return true
}
}
  
String toString(){
return this.CourseCode;
}
  
}

class Grade{
double grade;
String letter_grade;
  
public Grade(String letter_grade){
this.letter_grade = letter_grade
  
}
  
double convertLetter(){
if(this.letter_grade.equals("AA"))
this.grade = 4.0;
else if(this.letter_grade.equals("BA"))
this.grade = 3.5;
else if(this.letter_grade.equals("BB"))
this.grade = 3.0;
else if(this.letter_grade.equals("CB"))
this.grade = 2.5;
else if(this.letter_grade.equals("CC"))
this.grade = 2.0;
else if(this.letter_grade.equals("DC"))
this.grade = 1.5;
else if(this.letter_grade.equals("DD"))
this.grade = 1.0;
else if(this.letter_grade.equals("F"))
this.grade = 0;
else
this.grade = 0;
  
return letter_grade;
}
}

/* Name of the class has to be "Main" only if the class is public. */
class StudentAffair
{
   public static void main (String[] args) throws java.lang.Exception
   {
       Scanner sc = new Scanner(System.in);
       while(true){
       String s = sc.nextLine();
       if(s.equals("Q")
       break;
      
       Course c = new Course("aaa","asdf",12,2,3.5);
       Grade g = new Grade("AB");
       Student s = new Student("ABCD","123");
      
       c.addGrade(2.4);
       c.removeGrade(2.1);
      
       s.addGrade("AA");
       s.removeGrade(2);
       s.printGrade();
       }
   }
}