{"id":"chatcmpl-3d1db30090e94d16b0f826d05342bdd3","object":"chat.completion","created":1780122114,"model":"@cf/openai/gpt-oss-120b","choices":[{"index":0,"message":{"role":"assistant","content":"**Origin of “Hello, World!”**\n\n| Year | Event | Why it matters |\n|------|-------|----------------|\n| **1972** | Brian Kernighan’s tutorial *“A Tutorial Introduction to the Language B”* (a pre‑C language) includes the first known program that prints the literal string **`hello, world`**. | First documented use of the phrase as a program’s output. |\n| **1978** | Kernighan & Dennis Ritchie publish *The C Programming Language* (2nd ed.). The opening example program is: <br>`int main(void) { printf(\"hello, world\\n\"); return 0; }` | The book’s huge influence spreads the example to countless C learners, cementing the phrase in programming culture. |\n| **1980s‑1990s** | Text‑book authors and language manuals adopt the same example for new languages (Pascal, Java, Python, etc.). | Becomes the de‑facto “first program” for learning any language. |\n| **Present** | “Hello, World!” appears in tutorials, IDE templates, and even in non‑programming contexts (e.g., API demos, hardware tests). | Symbolizes a minimal, successful run and a friendly introduction to a new system. |\n\n### Why “Hello, World?”?\n1. **Simplicity** – Only one statement is needed to produce visible output.\n2. **Universality** – The greeting is recognizable in virtually every culture, making it a neutral, friendly test.\n3. **Historical inertia** – Once the C book popularized it, later language designers copied the tradition to give learners a familiar starting point.\n\n### TL;DR\nThe phrase **“Hello, World!”** as a program output first appeared in Brian Kernighan’s 1972 B‑language tutorial and was popularized by the 1978 *The C Programming Language* book. Since then it has become the canonical “first program” for virtually every programming language.","refusal":null,"annotations":null,"audio":null,"function_call":null,"tool_calls":[],"reasoning_content":"The user asks: \"What is the origin of the phrase Hello, World?\" Need to answer concisely but with enough detail. Provide origin in programming, first used in 1978's \"The C Programming Language\" book? Actually first appears in 1972's \"A Tutorial Introduction to the Language B\" by Kernighan? Let's recall: The phrase \"Hello, World!\" as a program output originated with Brian Kernighan's 1972 tutorial \"A Tutorial Introduction to the Language B\" which printed \"hello, world\". Then popularized in 1978 book \"The C Programming Language\" by Kernighan and Ritchie, example program prints \"hello, world\". It became a tradition for first program in many languages. Also earlier usage: 1950s? Possibly earlier in early computer demos. But main origin is Kernighan. Provide explanation. Also mention why it's used: simple demonstration of basic syntax, output. Provide timeline. Also mention other languages and variations. Keep concise."},"logprobs":null,"finish_reason":"stop","stop_reason":null,"token_ids":null}],"service_tier":null,"system_fingerprint":null,"usage":{"prompt_tokens":90,"completion_tokens":638,"total_tokens":728,"prompt_tokens_details":{"cached_tokens":0}},"prompt_logprobs":null,"prompt_token_ids":null,"kv_transfer_params":null}