diff --git a/Codes/Group B/Code-B4.cpp b/Codes/Group B/Code-B4.cpp
new file mode 100644
index 0000000..e3682fe
--- /dev/null
+++ b/Codes/Group B/Code-B4.cpp	
@@ -0,0 +1,70 @@
+// Assignment A4 - (MUTEX AND SEMAPHORE)
+
+#include <iostream>
+using namespace std;
+
+class Synchronization {
+    int a[10]; // Increased buffer size to 10
+    int mutex;
+    int empty;
+    int full;
+    int in;
+    int out;
+
+    void wait(int &x) {
+        if (x > 0) x--;
+    }
+
+    void signal(int &x) {
+        x++;
+    }
+
+public:
+    Synchronization() : mutex(1), empty(10), full(0), in(0), out(0) {}
+
+    void producer() {
+        if (empty > 0 && mutex == 1) {
+            wait(empty);
+            wait(mutex);
+            cout << "Data to be produced: ";
+            int data;
+            cin >> data;
+            a[in] = data;
+            in = (in + 1) % 10; // Update for new buffer size
+            signal(mutex);
+            signal(full);
+        } else {
+            cout << "Buffer is full, cannot produce!" << endl;
+        }
+    }
+
+    void consumer() {
+        if (full > 0 && mutex == 1) {
+            wait(full);
+            wait(mutex);
+            cout << "Data consumed is: " << a[out] << endl; // Show consumed data
+            out = (out + 1) % 10; // Update for new buffer size
+            signal(mutex);
+            signal(empty);
+        } else {
+            cout << "Buffer is empty, cannot consume!" << endl;
+        }
+    }
+};
+
+int main() {
+    int fchoice;
+    Synchronization s;
+    do {
+        cout << "1. Producer\n2. Consumer\n3. Exit" << endl;
+        cout << "Enter your choice: ";
+        cin >> fchoice;
+        switch (fchoice) {
+            case 1: s.producer(); break;
+            case 2: s.consumer(); break;
+            case 3: break;
+            default: cout << "Invalid choice!" << endl; break;
+        }
+    } while (fchoice != 3);
+    return 0;
+}