哈囉，世界

The classical introductory exercise. Just say "Hello, World!".

"Hello, World!" is the traditional first program for beginning programming in a new language or environment.

The objectives are simple:

• Modify the provided code so that it produces the string "Hello, World!".
• Run the test suite and make sure that it succeeds.
• Submit your solution and check it at the website.

If everything goes well, you will be ready to fetch your first real exercise.