diff --git a/lectures/25_inheritance/students/student_test5.cpp b/lectures/25_inheritance/students/student_test5.cpp
new file mode 100644
index 0000000..f5dedef
--- /dev/null
+++ b/lectures/25_inheritance/students/student_test5.cpp
@@ -0,0 +1,88 @@
+#include <iostream>
+#include <string>
+
+class Human {
+// change this to protect so that these variables can be accessed by the derived class.
+protected:
+    std::string name;
+    int age;
+    int sleep_hours;
+
+public:
+    Human(std::string n, int a, int s) : name(n), age(a), sleep_hours(s) {}
+    ~Human(){
+	    std::cout << "Human Destructor" << std::endl;
+    }
+
+    void introduce() {
+        std::cout << "Hello, I am " << name << ", and I am " << age << " years old.\n";
+    }
+
+    void sleep() {
+        std::cout << name << " is " << age << " years old who sleeps " << sleep_hours << " hours a night.\n";
+    }
+};
+
+class Student : public Human {
+public:
+    Student(std::string n, int a, int s) : Human(n, a, s) {}
+    ~Student(){
+	    std::cout << "Student Destructor" << std::endl;
+    }
+    
+    void introduce() {
+        std::cout << "Hello, I am " << name << ", and I am " << age << " years old. I’m majoring in 'How did I get here?' with a minor in 'It sounded easier when I signed up.'\n";
+    }
+
+    void sleep() {
+        std::cout << name << " is a college student who sleeps " << sleep_hours << " hours a night, and sleep 2 hours during boring lectures.\n";
+    }
+};
+
+class CSStudent : public Student {
+public:
+    // note that CSStudent constructor needs to call Student constructor.
+    CSStudent(std::string n, int a, int s) : Student(n, a, s) {}
+    ~CSStudent(){
+	    std::cout << "CS Student Destructor" << std::endl;
+    }
+
+    void introduce() {
+        std::cout << "I am a CS student. My name is " << name << ", and I am " << age << " years old.\n";
+    }
+
+    void sleep() {
+        std::cout << name << " is a CS student who sleeps " << sleep_hours << " hours a night. "
+                  << "Or maybe, just a few minutes if the code compiles!\n";
+    }
+};
+
+int main() {
+    // Creating instances of each class with member variables
+    Human h("Alice", 30, 8);
+    Student s("Bob", 20, 5);
+    CSStudent cs("Charlie", 22, 2);
+
+    // Introducing Humans
+    std::cout << "--- Human introducing ---\n";
+    h.introduce();  // Output: Hello, I am Alice, and I am 30 years old.
+    
+    std::cout << "--- Student introducing ---\n";
+    s.introduce();  // Output: I am a student. My name is Bob, and I am 20 years old.
+
+    std::cout << "--- CS Student introducing ---\n";
+    cs.introduce();  // Output: I am a CS student. My name is Charlie, and I am 22 years old.
+
+    // Showing sleep behavior
+    std::cout << "--- Human sleep ---\n";
+    h.sleep();  // Output: Alice is 30 years old and sleeps 8 hours a night.
+
+    std::cout << "--- Student sleep ---\n";
+    s.sleep();  // Output: Bob is a student, and they sleep 5 hours a night.
+
+    std::cout << "--- CS Student introducing ---\n";
+    cs.sleep();  // Output: I am a CS student. My name is Charlie, and I am 22 years old.
+
+    return 0;
+}
+