adding student program

lectures/25_inheritance/students/student_test1.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <string>
+
+class Human {
+private:
+    std::string name;
+    int age;
+    int sleep_hours;
+
+public:
+    Human(std::string n, int a, int s) : name(n), age(a), sleep_hours(s) {}
+
+    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";
+    }
+};
+
+int main() {
+    // Creating instances of each class with member variables
+    Human h("Alice", 30, 8);
+
+    // Introducing Humans
+    std::cout << "--- Human introducing ---\n";
+    h.introduce();  // Output: Hello, I am Alice, and I am 30 years old.
+    
+    // Showing sleep behavior
+    std::cout << "--- Human sleep ---\n";
+    h.sleep();  // Output: Alice is 30 years old and sleeps 8 hours a night.
+
+    return 0;
+}