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72 lines
3.3 KiB
Markdown
72 lines
3.3 KiB
Markdown
---
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id: c-syntax
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title: "C Syntax"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["main function", "include stdio", "C 문법"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.86
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["c", "programming-language", "w3schools", "syntax"]
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raw_sources: ["https://www.w3schools.com/c/c_syntax.php"]
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applied_in: []
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github_commit: ""
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---
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# [[C Syntax]]
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## 🎯 한 줄 통찰 (One-line insight)
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The compiler is explicitly indifferent to whitespace and line breaks — the source shows the ENTIRE `main()` body collapsible onto a single line (`int main(){printf("Hello World!");return 0;}`) and produces identical behavior — meaning C's multi-line formatting convention exists purely for human readability, not because the language requires it, unlike languages where indentation/newlines are syntactically meaningful. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`#include <stdio.h>`** — includes a header enabling input/output functions like `printf()`; described as something that "almost always appears" in a C program. [S1]
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- **`main()`** — the special function where program execution begins; code inside its `{}` is what actually runs. [S1]
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- **Statement termination** — every C statement must end with a semicolon `;`. [S1]
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- **`return 0`** — ends `main()` and sends a value back to the operating system; `0` conventionally signals "everything worked." [S1]
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- **Whitespace insignificance** — blank lines and extra spaces are ignored by the compiler; used only to aid human readability. [S1]
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## 📖 세부 내용 (Details)
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- Standard multi-line form: `#include <stdio.h> int main() { printf("Hello World!"); return 0; }`. [S1]
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- Equivalent single-line form (compiler behaves identically): `int main(){printf("Hello World!");return 0;}`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **줄바꿈/공백은 순전히 가독성 목적**: 컴파일러가 여러 줄로 쓰인 코드와 한 줄로 압축한 코드를 동일하게 처리한다는 점이 직접적인 코드 비교로 증명됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 이 챕터의 문장 단위 분해 설명이 이후 모든 C 코드를 읽는 기초 독해 능력의 토대가 된다. [S1]
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## 💻 코드 패턴 (Code patterns)
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The canonical C program structure, annotated line by line:
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```c
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#include <stdio.h>
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int main() {
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printf("Hello World!");
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return 0;
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.86
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[C Tutorial]]
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- **관련 개념:** [[C Get Started]], [[C Statements]]
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- **참조 맥락:** C 프로그램 구조 설명 — 명령문(Statements) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C Syntax — https://www.w3schools.com/c/c_syntax.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C Syntax" page (Astra wiki-curation, P-Reinforce v3.1 format).
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