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10_Wiki/Dev/Topic_CSharp/CSharp_Operators_Logical.md

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+---
+id: csharp-operators-logical
+title: "C# Logical Operators"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["&& || ! C#", "C# 논리 연산자"]
+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", "operators", "logical"]
+raw_sources: ["https://www.w3schools.com/cs/cs_operators_logical.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSharp Logical Operators]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The three logical operators (`&&`, `||`, `!`) use the exact same symbols and short-circuit-implying descriptions ("returns True if BOTH statements are true" / "if ONE of the statements is true") as C/C++ — the only genuinely new element in this short chapter is that the operators combine `bool`-typed comparison results (themselves real `True`/`False` values, per the previous chapter) rather than C's 1/0 integer stand-ins, making a chain like `x < 5 && x < 10` operate on two authentic boolean values instead of two truthy integers. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`&&` (logical AND)** — returns `True` only if BOTH operand statements are true. [S1]
+- **`||` (logical OR)** — returns `True` if AT LEAST ONE operand statement is true. [S1]
+- **`!` (logical NOT)** — reverses the result: returns `False` if the inner expression is true (and vice versa). [S1]
+- **Combines with comparison operators** — logical operators are typically used to chain multiple comparison expressions together (e.g. `x < 5 && x < 10`). [S1]
+- **Deferred depth** — the tutorial explicitly defers deeper coverage to the upcoming Booleans and If...Else chapters. [S1]
+
+## 📖 세부 내용 (Details)
+- AND example: `x < 5 && x < 10`. [S1]
+- OR example: `x < 5 || x < 4`. [S1]
+- NOT example: `!(x < 5 && x < 10)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **연산자 기호와 의미는 C/C++와 동일, 피연산자 타입만 실질적 bool로 확인됨**: `&& || !` 세 연산자의 기호와 논리는 C/C++와 차이가 없지만, Comparison Operators 챕터에서 확인된 것처럼 이 연산자들이 결합하는 대상이 진짜 bool 값이라는 점이 C의 정수 기반 논리 판정과의 실질적 차이로 재확인됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — AND/OR/NOT 각각의 최소 예제식이 원문에서 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Logical AND/OR/NOT combining bool comparison results (C#):
+```csharp
+bool r1 = (x < 5 && x < 10);   // AND -- both must be true
+bool r2 = (x < 5 || x < 4);    // OR -- at least one must be true
+bool r3 = !(x < 5 && x < 10);  // NOT -- reverses the result
+```
+
+## ✅ 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 Operators Comparison]], [[CSharp Booleans]], [[CSharp Conditions]]
+- **참조 맥락:** Operators 섹션의 마지막 챕터 — Math 섹션으로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C# Logical Operators — https://www.w3schools.com/cs/cs_operators_logical.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C# Logical Operators" page (Astra wiki-curation, P-Reinforce v3.1 format).