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75 lines
3.4 KiB
Markdown
75 lines
3.4 KiB
Markdown
---
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id: c-functions
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title: "C Functions"
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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: ["void function", "function call", "C 함수"]
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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", "functions"]
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raw_sources: ["https://www.w3schools.com/c/c_functions.php"]
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applied_in: []
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github_commit: ""
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---
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# [[C Functions]]
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## 🎯 한 줄 통찰 (One-line insight)
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The source reveals that `main()` and `printf()` — the two things every C beginner types on day one — are ALREADY functions, meaning the concept being "introduced" in this chapter isn't new at all; the learner has been using functions the entire tutorial without a name for it, and this chapter is really just formalizing vocabulary for a pattern already internalized. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Function** — a block of code that only runs when explicitly CALLED, not automatically at declaration time. [S1]
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- **`void` return type** — indicates the function returns no value (covered in more depth in the Parameters chapter). [S1]
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- **Declaration vs. execution timing** — declaring a function only "saves it for later use"; nothing inside runs until it's called. [S1]
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- **Repeatable calls** — the same function can be called multiple times, each execution independent. [S1]
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- **Code reuse motivation** — "define the code once, and use it many times" is the core justification for functions. [S1]
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## 📖 세부 내용 (Details)
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- Calling the same function three times: `void myFunction() { printf("I just got executed!"); } int main() { myFunction(); myFunction(); myFunction(); return 0; }` — prints the message three times. [S1]
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- A function performing a fixed calculation: `void calculateSum() { int x = 5; int y = 10; int sum = x + y; printf("The sum of x + y is: %d", sum); }` — explicitly noted as LIMITED since x/y are hardcoded, motivating the next chapter's parameters. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — main()과 printf() 자체가 이미 함수라는 사실을 상기시키는 것이 이 챕터의 핵심 실전 통찰이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Calling the same function multiple times (C):
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```c
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void myFunction() {
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printf("I just got executed!");
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}
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int main() {
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myFunction();
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myFunction();
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myFunction();
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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 Memory RealLife]], [[C Functions Decl]]
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- **참조 맥락:** 함수 섹션 첫 챕터 — 함수 선언과 정의(Functions Decl) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C Functions — https://www.w3schools.com/c/c_functions.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C Functions" page (Astra wiki-curation, P-Reinforce v3.1 format).
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