From 7e279062452a5212763ec3747b8f6f510e889537 Mon Sep 17 00:00:00 2001
From: ava <sanatkarava@gmail.com>
Date: Tue, 21 Apr 2026 00:26:14 +0330
Subject: [PATCH] hal tamrin

---
 src/CourseRegistrationStarter/Main.java       | 24 ++++++++++++++--
 .../RegistrationSystem.java                   | 12 ++++++++
 src/CourseRegistrationStarter/Student.java    | 28 +++++++++++++++++++
 3 files changed, 62 insertions(+), 2 deletions(-)

diff --git a/src/CourseRegistrationStarter/Main.java b/src/CourseRegistrationStarter/Main.java
index 8f06373..76fa643 100644
--- a/src/CourseRegistrationStarter/Main.java
+++ b/src/CourseRegistrationStarter/Main.java
@@ -10,5 +10,25 @@ public class Main {
         // 5. Register the student in some courses
         // 6. Drop one course
         // 7. Print the final registered course list
-    }
-}
+
+                Course c1 = new Course("Math", "M101", 3);
+                Course c2 = new Course("Physics", "P202", 2);
+                Course c3 = new Course("Programming", "CS303", 1);
+                Student s1 = new Student("Ali", "S123");
+
+                RegistrationSystem system = new RegistrationSystem();
+
+                system.addCourseToSystem(c1);
+                system.addCourseToSystem(c2);
+                system.addCourseToSystem(c3);
+
+                s1.addCourse(c1);
+                s1.addCourse(c2);
+
+                s1.dropCourse(c1);
+
+                s1.showRegisteredCourses();
+            }
+        }
+
+
diff --git a/src/CourseRegistrationStarter/RegistrationSystem.java b/src/CourseRegistrationStarter/RegistrationSystem.java
index 934f222..162120b 100644
--- a/src/CourseRegistrationStarter/RegistrationSystem.java
+++ b/src/CourseRegistrationStarter/RegistrationSystem.java
@@ -10,15 +10,27 @@ public class RegistrationSystem {
 
     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
+        //return null;
+        for (Course c : courses) {
+            if (c.getCourseCode().equals(code)) {
+                return c;
+            }
+        }
         return null;
     }
 
     public void showAllCourses() {
         // TODO: Print all courses in the system
+        for (Course c : courses) {
+            System.out.println(c.getCourseName() + " (" + c.getCourseCode() + ") Capacity: " + c.getCapacity());
+        }
+
     }
 }
diff --git a/src/CourseRegistrationStarter/Student.java b/src/CourseRegistrationStarter/Student.java
index 02c11d8..4128a0e 100644
--- a/src/CourseRegistrationStarter/Student.java
+++ b/src/CourseRegistrationStarter/Student.java
@@ -23,17 +23,45 @@ 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
+       // return false;
+        if (registeredCourses.contains(c)) {
+            return false;
+        }
+
+        if (c.reduceCapacity()) {
+            registeredCourses.add(c);
+            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
+        //return false;
+        if (registeredCourses.contains(c)) {
+            registeredCourses.remove(c);
+            c.increaseCapacity();
+            return true;
+        }
+
         return false;
+
     }
 
     public void showRegisteredCourses() {
         // TODO: Print all registered courses
+        if (registeredCourses.isEmpty()) {
+            System.out.println("No courses registered.");
+            return;
+        }
+
+        for (Course c : registeredCourses) {
+            System.out.println(c.getCourseName() + " (" + c.getCourseCode() + ")");
+        }
+
     }
 }
\ No newline at end of file