diff --git a/00 Inbox/29605321 - OOP 4_16.md b/00 Inbox/29605321 - OOP 4_16.md
index 553e9be..4ab724d 100644
--- a/00 Inbox/29605321 - OOP 4_16.md	
+++ b/00 Inbox/29605321 - OOP 4_16.md	
@@ -36,6 +36,14 @@ void upgrade(*Pokemon p, int gainedExp) {
 		p->level += 1;	
 	}
 }
+
+int main() {
+	Pokemon fukano = {3600, 1, 400, 400, 20, 1200};
+	printf("Exp of fukano: %d", fukano);
+	upgrade(&fukano, 400);
+	printf("Exp of fukano: %d", fukano);
+	return 0;
+}
 ```
 
 In C++ we use classes:
@@ -57,4 +65,11 @@ public: // visibility modifier
 		}
 	}
 }
+
+int main() {
+	Pokemon fukano = {3600, 1, 400, 400, 20, 1200};
+	cout << "Exp of fukano: " << fukano.exp << endl;
+	fukano.upgrade(400);
+	cout << "Exp of fukano: " << fukano.exp << endl;
+}
 ```
\ No newline at end of file