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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-comments C Comments Programming_Language draft conceptual
single-line comments
multi-line comments
C 주석
B 0.85 2026-07-04 2026-07-04
c
programming-language
w3schools
comments
https://www.w3schools.com/c/c_comments.php

C Comments

🎯 한 줄 통찰 (One-line insight)

Before C99 (1999), single-line // comments were NOT part of standard C at all — only /* */ multi-line comments existed — meaning // comments, now the default choice for short notes, are actually a relatively recent addition to the language's ~50-year history, not an original feature. [S1]

🧠 핵심 개념 (Core concepts)

  • Single-line comments (//) — everything from // to the end of the line is ignored by the compiler. [S1]
  • Multi-line comments (/* */) — everything between the markers is ignored, regardless of line count. [S1]
  • Comments as code-disabling tool// can be prefixed to a line of working code to temporarily disable it during testing, without deleting it. [S1]
  • Historical constraint — pre-C99, only /* */ was valid; // support was added in the C99 standard. [S1]

📖 세부 내용 (Details)

  • Single-line comment before code: // This is a comment followed by printf("Hello World!");. [S1]
  • Single-line comment disabling code: printf("This will run"); // printf("This will NOT run");. [S1]
  • Multi-line comment: /* The code below will print the words Hello World! to the screen, and it is amazing */ printf("Hello World!");. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • // 주석의 표준화 시점: C99(1999) 이전에는 다중 줄 주석(/* */)만 사용 가능했고, 한 줄 주석(//)은 C99부터 표준에 포함되었다는 역사적 사실이 명시됨 — 구형 컴파일러/표준 준수 코드 작성 시 유의해야 할 사항. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 특정 코드 줄을 지우지 않고 // 로 임시 비활성화하는 것이 실전 디버깅/테스트에서 흔히 쓰이는 기법이다. [S1]

💻 코드 패턴 (Code patterns)

Temporarily disabling a line of code using a single-line comment instead of deleting it (C):

printf("This will run");
// printf("This will NOT run");

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 Comments" page (Astra wiki-curation, P-Reinforce v3.1 format).