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10_Wiki/Dev/Topic_C/C_Conditions_Else.md

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+---
+id: c-conditions-else
+title: "C Else"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["else statement", "C else 문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.84
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["c", "programming-language", "w3schools", "conditions", "else"]
+raw_sources: ["https://www.w3schools.com/c/c_conditions_else.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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):
+```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).