diff --git a/src/CourseRegistrationStarter/Main.java b/src/CourseRegistrationStarter/Main.java
index 8f06373..a2305e8 100644
--- a/src/CourseRegistrationStarter/Main.java
+++ b/src/CourseRegistrationStarter/Main.java
@@ -1,7 +1,120 @@
 package CourseRegistrationStarter;
 
+import java.util.Scanner;
+
 public class Main {
     public static void main(String[] args) {
+
+
+        RegistrationSystem register = new RegistrationSystem();
+        Course riazi1 = new Course("riazi1" , "200" , 5);
+        Course riazi2 = new Course("riazi2" , "201" , 4);
+        Course ap = new Course("ap" , "202" , 10);
+        Course bp = new Course("bp" , "203" , 0);
+
+        register.addCourseToSystem(riazi1);
+        register.addCourseToSystem(riazi2);
+        register.addCourseToSystem(ap);
+        register.addCourseToSystem(bp);
+
+        Student daneshjo = new Student("ali" , "404222000");
+        boolean yes = true;
+
+        while( yes == true ){
+
+            System.out.println("----------Menu----------");
+            System.out.println("1. show all course");
+            System.out.println("2. add course");
+            System.out.println("3. delete course");
+            System.out.println("4.my course");
+            System.out.println("5.exit");
+            System.out.print("choose item :");
+
+            Scanner input = new Scanner(System.in);
+            int n = input.nextInt();
+            n = (n % 5);
+
+            switch (n)
+            {
+                case 1:
+                {
+                    register.showAllCourses();
+                    break;
+                }
+                case 2:
+                {
+                    System.out.println("please enter the code of course");
+                    String courseCode = input.next();
+                    if(register.findCourseByCode(courseCode) != null){
+                        if(daneshjo.addCourse(register.findCourseByCode(courseCode))){
+                            System.out.println("done");
+                        }
+                        else{
+                            if(register.findCourseByCode(courseCode).getCapacity() <=0){
+                                System.out.println("cours is full");
+                            }
+                            else if(daneshjo.existe(register.findCourseByCode(courseCode))){
+                                System.out.println("you have get this course befor");
+                            }
+                            else {
+                                System.out.println("you have deleted this course befor");
+                            }
+                        }
+                    }
+                    else {
+                        System.out.println("invalid course");
+                    }
+                    break;
+                }
+
+                case 3:
+                {
+                    System.out.println("please enter the code of course");
+                    String courseCode = input.next();
+                    if(register.findCourseByCode(courseCode) != null){
+                        if(daneshjo.dropCourse(register.findCourseByCode(courseCode))){
+                            System.out.println("done");
+                        }
+                        else {
+                            System.out.println("invaild");
+                        }
+
+                    }
+                    else{
+                        System.out.println("Invalid course");
+                    }
+                    break;
+
+                }
+
+                case 4:
+                {
+                    daneshjo.showRegisteredCourses();
+                    break;
+                }
+
+                case 0:
+                {
+                    yes = false;
+                    break;
+                }
+
+
+            }
+
+
+
+
+
+
+
+
+
+
+
+
+
+        }
         // TODO:
         // 1. Create at least 3 courses
         // 2. Create 1 student
diff --git a/src/CourseRegistrationStarter/RegistrationSystem.java b/src/CourseRegistrationStarter/RegistrationSystem.java
index 934f222..6a684a7 100644
--- a/src/CourseRegistrationStarter/RegistrationSystem.java
+++ b/src/CourseRegistrationStarter/RegistrationSystem.java
@@ -5,20 +5,35 @@ public class RegistrationSystem {
     private ArrayList<Course> courses;
 
     public RegistrationSystem() {
-        courses = new ArrayList<>();
+        courses = new ArrayList<Course>();
     }
 
     public void addCourseToSystem(Course c) {
-        // TODO: Add the course to the system
+        courses.add(c);
     }
 
     public Course findCourseByCode(String code) {
-        // TODO: Search for a course by course code
-        // Return the matching course if found, otherwise return null
+        int n = courses.size();
+        for(int i = 0 ; i < n ; i++){
+            if(courses.get(i).getCourseCode().equals(code)){
+                return courses.get(i);
+            }
+
+        }
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+        int n = courses.size();
+        System.out.println("All courses :");
+        for(int i = 0 ; i < n ; i++){
+
+            System.out.printf("course name: %10s   "  , courses.get(i).getCourseName());
+            System.out.printf("course code: %10s   "  , courses.get(i).getCourseCode());
+            System.out.printf("cours capacity: %10s   " , courses.get(i).getCapacity());
+            System.out.println("");
+
+
+        }
     }
 }
diff --git a/src/CourseRegistrationStarter/Student.java b/src/CourseRegistrationStarter/Student.java
index 02c11d8..6d4a97a 100644
--- a/src/CourseRegistrationStarter/Student.java
+++ b/src/CourseRegistrationStarter/Student.java
@@ -5,11 +5,13 @@ public class Student {
     private String name;
     private String studentId;
     private ArrayList<Course> registeredCourses;
+    private ArrayList<Course> deletedCourse;
 
     public Student(String name, String studentId) {
         this.name = name;
         this.studentId = studentId;
         this.registeredCourses = new ArrayList<>();
+        this.deletedCourse = new ArrayList<>();
     }
 
     public String getName() {
@@ -21,19 +23,58 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
+        if(c.getCapacity() > 0&& !existe(c) && !checkdeleted(c)){
+            registeredCourses.add(c);
+            c.reduceCapacity();
+            return true;
+        }
         return false;
     }
 
     public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
-        // Restore the course capacity if removal was successful
-        // Return true if the course was dropped, otherwise false
+        int n = registeredCourses.size();
+        for(int i = 0 ; i < n ; i++){
+            if(registeredCourses.get(i).getCourseName() == c.getCourseName()){
+                registeredCourses.remove(i);
+                c.increaseCapacity();
+                deletedCourse.add(c);
+                return true;
+            }
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        int n = registeredCourses.size();
+        System.out.println(this.name + "\'s Courses :");
+        for(int i = 0 ; i < n ; i++){
+            System.out.printf("course name: %10s   "  , registeredCourses.get(i).getCourseName());
+            System.out.printf("cours code: %10s   " , registeredCourses.get(i).getCourseCode());
+            System.out.println("");
+        }
     }
-}
\ No newline at end of file
+
+    public  boolean checkdeleted(Course c){
+        int n = deletedCourse.size();
+        for(int i = 0 ; i < n ; i++){
+            if (deletedCourse.get(i).getCourseCode().equals(c.getCourseCode())){
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public  boolean existe(Course c){
+        int n = registeredCourses.size();
+        for(int i = 0 ; i < n ; i++){
+            if(registeredCourses.get(i).getCourseCode().equals(c.getCourseCode())){
+                return true;
+            }
+
+        }
+        return false;
+    }
+
+}
+