docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동

최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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+---
+id: cpp-switch
+title: "C++ Switch"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["switch case", "break keyword", "default keyword", "C++ switch 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: ["cpp", "programming-language", "w3schools", "switch"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_switch.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Switch]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The syntax overview explicitly labels `break` and `default` as "optional" — a framing C's chapter never used — yet the same fall-through risk applies identically: without `break`, execution continues into subsequent cases regardless of match, meaning "optional" describes their SYNTACTIC status (the switch compiles without them) rather than their PRACTICAL necessity for correct behavior. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`switch (expression)`** — evaluates the expression ONCE, then compares it against each `case` value. [S1]
+- **`case x:`** — a candidate value to match; its block runs if the switch expression equals `x`. [S1]
+- **`break`** — exits the switch block once a match is handled; described as OPTIONAL syntactically, though omitting it causes execution to fall through into later cases. [S1]
+- **`default:`** — runs if no case matches; also optional. [S1]
+
+## 📖 세부 내용 (Details)
+- Weekday-name lookup via switch: `int day = 4; switch (day) { case 1: cout << "Monday"; break; ... case 4: cout << "Thursday"; break; ... }` — outputs "Thursday" for day 4. [S1]
+- Using default for unmatched cases: `int day = 4; switch (day) { case 6: cout << "Today is Saturday"; break; case 7: cout << "Today is Sunday"; break; default: cout << "Looking forward to the Weekend"; }` — day 4 matches neither case 6 nor 7, so default runs. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **break와 default는 "선택 사항"이지만 실질적으로는 거의 필수**: 문법적으로는 생략 가능하다고 명시되지만, break가 없으면 이후 case로 계속 실행이 이어지는(fall-through) 문제가 C 챕터와 동일하게 존재함이 확인됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+요일 번호(1-7)를 요일 이름으로 변환하는 예제와, 주말이 아닌 요일에 대해 default로 메시지를 출력하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Using default to handle any value not matched by an explicit case (C++):
+```cpp
+int day = 4;
+switch (day) {
+  case 6:
+    cout << "Today is Saturday";
+    break;
+  case 7:
+    cout << "Today is Sunday";
+    break;
+  default:
+    cout << "Looking forward to the Weekend";
+}
+// Outputs "Looking forward to the Weekend"
+```
+
+## ✅ 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:** [[CPP Conditions RealLife]], [[CPP While Loop]], [[C Switch]]
+- **참조 맥락:** switch 섹션 유일 챕터 — 반복문(Loops) 섹션의 while 루프(While Loop) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Switch — https://www.w3schools.com/cpp/cpp_switch.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Switch" page (Astra wiki-curation, P-Reinforce v3.1 format).