"Hello, world!" is often used as the first program when learning a new programming language because it's a simple yet effective way to ensure that the programming environment is set up correctly and that the programmer understands the basic syntax of the language. It's a tradition and a quick way to verify that everything is working as expected.


"Hi" and "hello" are both common greetings used to acknowledge someone's presence or initiate a conversation. The main difference is in their formality and usage. "Hello" tends to be slightly more formal and polite, while "hi" is often seen as more casual and informal. Additionally, "hello" is often used in written communication and in more formal settings, whereas "hi" is commonly used in spoken language and casual situations. Ultimately, both serve the same purpose of greeting someone.



이런 거 이해할 정도면 된다.