class NotepadPlusPlus:
    def __init__(self):
        self.text = ""

    def open_file(self, file_name):
        with open(file_name, 'r') as file:
            self.text = file.read()

    def save_file(self, file_name):
        with open(file_name, 'w') as file:
            file.write(self.text)

    def add_info(self, info):
        self.text += "\n" + info

    def display_text(self):
        print(self.text)

# Пример использования
notepad = NotepadPlusPlus()
notepad.open_file("example.txt")
notepad.add_info("Additional information about the program")
notepad.save_file("example_updated.txt")