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69 lines
3.3 KiB
Markdown
69 lines
3.3 KiB
Markdown
---
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id: c-constants
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title: "C Constants"
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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: ["const keyword", "read-only variables", "C 상수"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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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", "constants"]
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raw_sources: ["https://www.w3schools.com/c/c_constants.php"]
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applied_in: []
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github_commit: ""
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---
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# [[C Constants]]
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## 🎯 한 줄 통찰 (One-line insight)
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A `const` variable MUST be assigned a value at the moment of declaration — declaring it first and assigning later (`const int minutesPerHour; minutesPerHour = 60;`) is explicitly shown as an error — meaning `const` isn't just "can't change later," it also removes the two-step declare-then-assign pattern that ordinary variables freely support. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`const` keyword** — makes a variable unchangeable/read-only after its initial assignment. [S1]
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- **Mandatory initialization** — a `const` variable must receive its value at declaration time; assigning it afterward is a compile error. [S1]
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- **Uppercase naming convention** — while not required, C programmers commonly write constant names in uppercase (e.g. `BIRTHYEAR`) for readability. [S1]
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- **Use case** — values unlikely to ever change during program execution (e.g. `minutesPerHour`, `monthsInYear`). [S1]
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## 📖 세부 내용 (Details)
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- Attempting reassignment fails: `const int myNum = 15; myNum = 10; // error: assignment of read-only variable 'myNum'`. [S1]
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- Declare-without-assign fails: `const int minutesPerHour; minutesPerHour = 60; // error`. [S1]
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- Uppercase convention: `const int BIRTHYEAR = 1980;`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **const는 선언과 동시에 초기화 필수**: 일반 변수처럼 먼저 선언만 하고 나중에 값을 대입하는 방식이 const에서는 컴파일 에러를 발생시킨다는 점이 명시적으로 확인됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 시간당 분(60), 연중 개월 수(12)처럼 절대 변하지 않는 값을 const로 선언하는 것이 실전 코드에서의 표준 활용이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Declaring constants that must be initialized at the point of declaration (C):
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```c
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const int minutesPerHour = 60;
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const int monthsInYear = 12;
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const int BIRTHYEAR = 1980; // uppercase is a common naming convention
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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:** 0.85
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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 Data Types RealLife]], [[C Storage Classes]]
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- **참조 맥락:** 상수 선언 — 저장 클래스(Storage Classes) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C Constants — https://www.w3schools.com/c/c_constants.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C Constants" page (Astra wiki-curation, P-Reinforce v3.1 format).
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