adding exercise 1

lectures/25_inheritance/exercises/exercise1.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+
+class A {
+public:
+    A() {
+        std::cout << "A";
+    }
+    ~A() {
+        std::cout << "A";
+    }
+};
+
+class B : public A {
+public:
+    B() {
+        std::cout << "B";
+    }
+    ~B() {
+        std::cout << "B";
+    }
+};
+
+int main() {
+    {
+        A a;
+        B b;
+    }
+    std::cout << std::endl;
+    return 0;
+}
+