{"choices":[{"finish_reason":"length","index":0,"logprobs":null,"message":{"annotations":null,"audio":null,"content":"**Short answer:**  \nThe “Hello, World!” program first appeared in a 1972 tutorial for the B programming language written by Brian Kernighan. It was later cemented in the programming community by the 1978 book *The C Programming Language* (the “K&R” book) and has been the de‑facto first example for virtually every language ever since.\n\n---\n\n## A brief timeline\n\n| Year | Event | Why it matters |\n|------|-------|----------------|\n| **1972** | Brian Kernighan publishes *“A Tutorial Introduction to the Language B”* (Bell Labs memorandum). The sample program prints `hello, world`. | First known printed instance of the phrase used as a minimal, self‑contained program. |\n| **1973‑1974** | The B tutorial is re‑issued as part of the *UNIX Programmer’s Manual* (Version 1). | The example spreads to the early UNIX community, which is already a hub for new languages. |\n| **1978** | Kernighan & Dennis Ritchie release *The C Programming Language* (2nd ed. 1988). The opening example program is: <br>`int main(void) { printf(\"hello, world\\n\"); return 0; }` | The book becomes the definitive C reference; the example is copied into countless textbooks, manuals, and course notes. |\n| **Early 1980s** | The phrase appears in introductory material for other languages (Pascal, BASIC, Lisp, etc.) as a “canonical first program”. | The habit spreads beyond C and UNIX to the broader computer‑science curriculum. |\n| **1990s‑2000s** | “Hello, World!” is used as a test for compiler installations, as a sanity‑check in tutorials, and as a cultural meme (e.g., T-shirts, jokes, Easter eggs). | The phrase becomes a rite of passage for programmers and a shorthand for “the simplest possible program”. |\n| **2010s‑present** | “Hello, World!” appears in virtually every language’s “getting started” page, from JavaScript and Python to Rust, Go, Swift, and even esoteric languages. | The tradition is now a universal programming‑culture touchstone. |\n\n---\n\n## Why Kernighan chose those words\n\n* **Simplicity:** The program does exactly one thing—display a short, human‑readable string—so the code stays minimal (just a `printf`/`puts` call and a `return`).  \n* **Friendliness:** “Hello, world” sounds like a greeting, making the first interaction with a new language feel welcoming rather than intimidating.  \n* **Universality:** “World” is a neutral, all‑encompassing noun, avoiding any domain‑specific jargon.\n\nKernighan himself has said that the phrase was simply a convenient placeholder, not a deep philosophical statement. In the pre‑internet era, a short literal string was the easiest way to prove that a program compiled, linked, and could produce output on a terminal.\n\n---\n\n## Earlier precedents (if any)\n\n* **1960s‑early‑70s** – In some early programming textbooks (e.g., *Computer Programming in BASIC* by J. W. M. McCarthy, 1965) the first example prints a constant string, but none use the exact phrase “Hello, World”.  \n* **1970** – The *BASIC* language’s first example in the *Altair BASIC* manual prints `HELLO`. This shows the idea of a greeting existed, but the specific two‑word phrase appears first in Kernighan’s B tutorial.  \n\nThus, while the concept of printing a simple literal predates it, the exact wording “Hello, World” originates with Kernighan’s 1972 B tutorial.\n\n---\n\n## Cultural impact\n\n* **Teaching tool:** Every introductory programming course still starts with it.  \n* **Testing tool:** Developers use it to verify that a compiler, interpreter, or runtime environment is correctly installed.  \n* **","function_call":null,"reasoning":"We need to answer: origin of phrase \"Hello, World\". Provide concise but thorough explanation: earliest use in programming examples, Brian Kernighan's 1972 C tutorial, earlier use in 1960s? Actually first known use in 1972 \"A Tutorial Introduction to the Language B\" by Kernighan (Bell Labs) which printed \"hello, world\". Then K&R C book 1978. Also earlier in 1971? There was \"Hello, World!\" in 1960s? The phrase might have origins in a 1970s textbook for the language B; later popularized by K&R. Also earlier use in IBM? Also \"Hello World\" appears in 1975 \"The C Programming Language\" book. Provide timeline. Also mention it's used as first program for novices.\n\nThus answer.","reasoning_content":"We need to answer: origin of phrase \"Hello, World\". Provide concise but thorough explanation: earliest use in programming examples, Brian Kernighan's 1972 C tutorial, earlier use in 1960s? Actually first known use in 1972 \"A Tutorial Introduction to the Language B\" by Kernighan (Bell Labs) which printed \"hello, world\". Then K&R C book 1978. Also earlier in 1971? There was \"Hello, World!\" in 1960s? The phrase might have origins in a 1970s textbook for the language B; later popularized by K&R. Also earlier use in IBM? Also \"Hello World\" appears in 1975 \"The C Programming Language\" book. Provide timeline. Also mention it's used as first program for novices.\n\nThus answer.","refusal":null,"role":"assistant"},"routed_experts":null,"stop_reason":null,"token_ids":null}],"created":1787210872,"ec_transfer_params":null,"id":"chatcmpl-b264c59a-3f3b-498b-8102-394c66d11e84","kv_transfer_params":null,"metrics":null,"model":"@cf/openai/gpt-oss-120b","object":"chat.completion","prompt_logprobs":null,"prompt_text":null,"prompt_token_ids":null,"service_tier":null,"usage":{"prompt_tokens":84,"completion_tokens":1024,"total_tokens":1108,"prompt_tokens_details":{"cached_tokens":0},"neurons":72.49087524414062}}