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10_Wiki/Dev/Topic_CSharp/CSharp_Switch.md

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+---
+id: csharp-switch
+title: "C# Switch"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["switch case break default C#", "C# 스위치문"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.82
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["csharp", "programming-language", "w3schools", "switch"]
+raw_sources: ["https://www.w3schools.com/cs/cs_switch.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSharp Switch]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The `switch(expression) { case x: ... break; default: ... break; }` skeleton is structurally identical to C/C++'s switch statement — same `case`/`break`/`default` keywords, same "evaluate once, compare against each case" model — making Switch the fourth chapter in the C# series (after Comments, Operators, Special Characters) where the answer to "what's different from C++" is essentially nothing at the syntax level shown here. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`switch(expression)`** — evaluated exactly ONCE, then compared against each `case` value in order. [S1]
+- **`case x:`** — if the switch expression matches `x`, that block's code runs. [S1]
+- **`break`** — exits the switch block immediately once a match's code has run, preventing execution from continuing into subsequent cases; described as saving execution time by skipping the rest of the block. [S1]
+- **`default:`** — optional; runs when NO case matches the expression. [S1]
+
+## 📖 세부 내용 (Details)
+- Weekday-name example: `switch (day) { case 1: Console.WriteLine("Monday"); break; ... case 7: Console.WriteLine("Sunday"); break; }` with `day = 4` → outputs `"Thursday"`. [S1]
+- Default fallback example: `switch (day) { case 6: ...Saturday...; break; case 7: ...Sunday...; break; default: Console.WriteLine("Looking forward to the Weekend."); break; }` with `day = 4` (no matching case) → outputs `"Looking forward to the Weekend."` via `default`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **switch 구조가 C/C++와 동일**: `switch`/`case`/`break`/`default` 키워드와 전체 구조가 C/C++의 switch문과 차이가 없다는 점이 확인됨 — Comments, Operators, Special Characters에 이은 네 번째 "구조 동일" 챕터. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+요일 번호(day)를 받아 요일 이름을 출력하는 switch문과, 매치되는 case가 없을 때 default로 넘어가는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Switch with break and default (C#):
+```csharp
+int day = 4;
+switch (day)
+{
+    case 1:
+        Console.WriteLine("Monday");
+        break;
+    case 4:
+        Console.WriteLine("Thursday");
+        break;
+    default:
+        Console.WriteLine("Looking forward to the Weekend.");
+        break;
+}
+// Outputs "Thursday"
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.82
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C# Tutorial]]
+- **관련 개념:** [[CSharp Conditions Shorthand]], [[CSharp While Loop]], [[CPP Switch]]
+- **참조 맥락:** Switch 섹션의 유일 챕터 — Loops 섹션으로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C# Switch — https://www.w3schools.com/cs/cs_switch.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C# Switch" page (Astra wiki-curation, P-Reinforce v3.1 format).