2nd/10_Wiki/Dev/Topic_C/C_Conditions_Else.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-conditions-else	C Else	Programming_Language	draft	conceptual		else statement C else 문		B	0.84	2026-07-04	2026-07-04			c programming-language w3schools conditions else	https://www.w3schools.com/c/c_conditions_else.php

C Else

🎯 한 줄 통찰 (One-line insight)

Naming a boolean condition variable descriptively (isDay instead of a raw time < 18 expression) doesn't change the program's behavior at all — it's purely a communication device for future readers — and the source explicitly frames this as its entire justification: "makes it easy to understand what the condition means," not a performance or correctness improvement. [S1]

🧠 핵심 개념 (Core concepts)

• else — runs a block of code when the paired if condition is false; there is no separate condition to check for else itself. [S1]
• Mutually exclusive branches — exactly one of the if or else block executes, never both, never neither. [S1]
• Descriptive boolean naming — storing a condition in a variable like isDay documents the condition's MEANING, not just its mechanics. [S1]

📖 세부 내용 (Details)

• Basic if/else: int time = 20; if (time < 18) { printf("Good day."); } else { printf("Good evening."); } // Outputs "Good evening.". [S1]
• Same logic with a descriptively-named boolean: bool isDay = time < 18; if (isDay) { printf("Good day."); } else { printf("Good evening."); }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

시간(time)이 18보다 작은지에 따라 "좋은 하루"/"좋은 저녁"을 출력하는 예제가 원문에서 직접 실전 활용 사례로 제시됨(시간대 기반 인사말 로직). [S1]

💻 코드 패턴 (Code patterns)

Naming a boolean condition descriptively for readability (C):

int time = 20;
bool isDay = time < 18;
if (isDay) {
  printf("Good day.");
} else {
  printf("Good evening.");
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.84
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C Tutorial
• 관련 개념: C Conditions, C Conditions ElseIf
• 참조 맥락: else 문 — else if 문(Conditions ElseIf) 챕터로 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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