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10_Wiki/Topic_Programming/Topic_CPP/CPP_Conditions_Logical.md

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+---
+id: cpp-conditions-logical
+title: "C++ Logical Operators in Conditions"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["access control logic", "&& || ! in if", "C++ 조건문 논리 연산자"]
+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", "conditions", "logical-operators"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_conditions_logical.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Logical Operators in Conditions]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The exact same nested access-control rule (`isLoggedIn && (isAdmin || securityLevel <= 2)`) and the exact same four worked-through securityLevel outcomes (1/2 granted, 3/4 denied) reappear identically from C's chapter — confirming this specific compound authorization pattern was deliberately carried over as the canonical teaching example for combining `&&`/`||` across both languages. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`&&` (AND)** — both conditions must be true. [S1]
+- **`||` (OR)** — at least one condition must be true. [S1]
+- **`!` (NOT)** — reverses a condition's truth value. [S1]
+- **Nested logical composition** — parentheses group sub-conditions that combine with another condition via `&&`, mirroring real authorization rules. [S1]
+
+## 📖 세부 내용 (Details)
+- AND: `int a = 200, b = 33, c = 500; if (a > b && c > a) { cout << "Both conditions are true"; }`. [S1]
+- OR: `if (a > b || a > c) { cout << "At least one condition is true"; }`. [S1]
+- NOT: `int a = 33; int b = 200; if (!(a > b)) { cout << "a is NOT greater than b"; }`. [S1]
+- Full access-control rule with worked-through outcomes: `bool isLoggedIn = true; bool isAdmin = false; int securityLevel = 3; if (isLoggedIn && (isAdmin || securityLevel <= 2)) { cout << "Access granted."; } else { cout << "Access denied."; }` — securityLevel 1 or 2 → granted; 3 or 4 → denied (unless isAdmin is true). [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources). C 챕터의 접근 제어 예제와 완전히 동일함이 확인됨.
+
+## 🛠️ 적용 사례 (Applied in summary)
+로그인 여부(isLoggedIn) + (관리자이거나(isAdmin) 보안등급이 2 이하(securityLevel <= 2))를 결합한 접근 제어 규칙이 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Nested AND/OR logic for a real-world access-control rule (C++):
+```cpp
+bool isLoggedIn = true;
+bool isAdmin = false;
+int securityLevel = 3; // 1 = highest
+if (isLoggedIn && (isAdmin || securityLevel <= 2)) {
+  cout << "Access granted.";
+} else {
+  cout << "Access denied.";
+}
+```
+
+## ✅ 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 Shorthand]], [[CPP Operators Logical]], [[CPP Conditions Nested]]
+- **참조 맥락:** 조건문 내 논리 연산자 — 중첩 if(Conditions Nested) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Logical Operators in Conditions — https://www.w3schools.com/cpp/cpp_conditions_logical.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Logical Operators in Conditions" page (Astra wiki-curation, P-Reinforce v3.1 format).