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10_Wiki/Topic_Programming/Topic_C/C_Conditions_ElseIf.md

@@ -0,0 +1,72 @@
+---
+id: c-conditions-elseif
+title: "C Else If"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["else if chain", "top to bottom evaluation", "C else if 문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.85
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["c", "programming-language", "w3schools", "conditions", "else-if"]
+raw_sources: ["https://www.w3schools.com/c/c_conditions_elseif.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[C Else If]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Conditions in an if/else-if chain are checked strictly top-to-bottom and STOP at the first true match — the source's time example explicitly notes "as soon as one condition is true, its block of code runs, and the rest are skipped," meaning even if a later condition would ALSO be true, only the FIRST matching branch ever executes; chain ORDER therefore determines behavior, not just correctness of each individual condition. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`else if`** — tests a new condition only if the preceding condition(s) were false; can be chained multiple times. [S1]
+- **First-match-wins evaluation** — conditions are checked top to bottom; the FIRST true condition's block runs and all subsequent conditions in the chain are skipped, even if they'd also evaluate true. [S1]
+- **Boolean-variable chaining** — each condition in the chain can be pre-computed into a descriptively-named bool (`isMorning`, `isDay`) for readability. [S1]
+
+## 📖 세부 내용 (Details)
+- Time-of-day chain: `int time = 16; if (time < 12) { printf("Good morning."); } else if (time < 18) { printf("Good day."); } else { printf("Good evening."); } // Outputs "Good day."` — the first condition (`time < 12`) is false, the second (`time < 18`) is true, so only "Good day." prints. [S1]
+- Same chain with named booleans: `bool isMorning = time < 12; bool isDay = time < 18; if (isMorning) {...} else if (isDay) {...} else {...}`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **첫 번째로 참인 조건만 실행됨**: 체인 내 여러 조건이 이론상 동시에 참일 수 있어도, 위에서부터 먼저 참으로 판정된 조건의 블록만 실행되고 나머지는 건너뛴다는 점이 명시적으로 강조됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 시간대에 따라 아침/낮/저녁 인사를 구분하는 것이 else if 체인의 대표적인 실전 활용 예시다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Chained else-if conditions evaluated top-to-bottom, stopping at the first match (C):
+```c
+int time = 16;
+if (time < 12) {
+  printf("Good morning.");
+} else if (time < 18) {
+  printf("Good day.");
+} else {
+  printf("Good evening.");
+}
+// Outputs "Good day."
+```
+
+## ✅ 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 Conditions Else]], [[C Conditions Short Hand]]
+- **참조 맥락:** else if 체인 — 삼항 연산자(Conditions Short Hand) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C Else If — https://www.w3schools.com/c/c_conditions_elseif.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C Else If" page (Astra wiki-curation, P-Reinforce v3.1 format).