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10_Wiki/Dev/Topic_CPP/CPP_Conditions.md

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+---
+id: cpp-conditions
+title: "C++ If ... Else"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["if statement", "lowercase if", "C++ 조건문"]
+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", "if-statement"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_conditions.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP If ... Else]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Every rule from C's `if` chapter carries over verbatim — lowercase-only `if` (uppercase `If`/`IF` errors), the same six comparison operators, and the same bool-variable-for-readability pattern — meaning C++'s conditional syntax is a direct, unmodified continuation of C's, with the only visible difference being `cout <<` replacing `printf()` inside the branches. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Six comparison conditions** — `<`, `<=`, `>`, `>=`, `==`, `!=`, identical to C. [S1]
+- **Four conditional constructs** — `if`, `else`, `else if`, `switch` — same set as C. [S1]
+- **Case-sensitive keyword** — `if` must be lowercase; `If`/`IF` produce an error. [S1]
+- **Boolean-variable readability pattern** — storing a comparison's result in a `bool` variable before using it in `if` improves readability for complex/reused conditions. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic if with variables: `int x = 20; int y = 18; if (x > y) { cout << "x is greater than y"; }`. [S1]
+- Using a boolean variable to hold the condition: `bool isGreater = x > y; if (isGreater) { cout << "x is greater than y"; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources). C 챕터와 동일한 규칙임이 확인됨.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 복잡하거나 재사용되는 조건을 bool 변수에 미리 담아두는 패턴이 가독성 있는 조건문 작성의 실전 관행이다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Storing a condition in a readable boolean variable before using it in an if statement (C++):
+```cpp
+int x = 20;
+int y = 18;
+bool isGreater = x > y;
+if (isGreater) {
+  cout << "x is greater than y";
+}
+```
+
+## ✅ 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 Booleans RealLife]], [[CPP Conditions Else]], [[C Conditions]]
+- **참조 맥락:** 조건문 섹션 첫 챕터 — else 문(Conditions Else) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ If ... Else — https://www.w3schools.com/cpp/cpp_conditions.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ If ... Else" page (Astra wiki-curation, P-Reinforce v3.1 format).