2nd/10_Wiki/Dev/Topic_C/C_Comments.md

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)

• 상위/루트: C Tutorial
• 관련 개념: C Output, C Organize Code
• 참조 맥락: 주석 문법 — 코드 조직화(Organize Code) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C Comments — https://www.w3schools.com/c/c_comments.php

📝 변경 이력 (Change history)

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