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- Topic_Programming → Domain_Programming (내부 구조 보존)
- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
  Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing)
- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
- 빈 폴더 정리 (memory/procedures)
- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-11 11:05:56 +09:00

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id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
c-constants C Constants Programming_Language draft conceptual
const keyword
read-only variables
C 상수
B 0.85 2026-07-04 2026-07-04
c
programming-language
w3schools
constants
https://www.w3schools.com/c/c_constants.php

C Constants

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

  • const keyword — makes a variable unchangeable/read-only after its initial assignment. [S1]
  • Mandatory initialization — a const variable must receive its value at declaration time; assigning it afterward is a compile error. [S1]
  • Uppercase naming convention — while not required, C programmers commonly write constant names in uppercase (e.g. BIRTHYEAR) for readability. [S1]
  • Use case — values unlikely to ever change during program execution (e.g. minutesPerHour, monthsInYear). [S1]

📖 세부 내용 (Details)

  • Attempting reassignment fails: const int myNum = 15; myNum = 10; // error: assignment of read-only variable 'myNum'. [S1]
  • Declare-without-assign fails: const int minutesPerHour; minutesPerHour = 60; // error. [S1]
  • Uppercase convention: const int BIRTHYEAR = 1980;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • const는 선언과 동시에 초기화 필수: 일반 변수처럼 먼저 선언만 하고 나중에 값을 대입하는 방식이 const에서는 컴파일 에러를 발생시킨다는 점이 명시적으로 확인됨. [S1]

🛠️ 적용 사례 (Applied in summary)

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]

💻 코드 패턴 (Code patterns)

Declaring constants that must be initialized at the point of declaration (C):

const int minutesPerHour = 60;
const int monthsInYear = 12;
const int BIRTHYEAR = 1980;  // uppercase is a common naming convention

검증 상태 및 신뢰도

  • 상태: draft
  • 검증 단계: conceptual
  • 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
  • 신뢰 점수: 0.85
  • 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "C Constants" page (Astra wiki-curation, P-Reinforce v3.1 format).