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10_Wiki/Topic_Programming/Topic_CPP/CPP_Conditions_RealLife.md

@@ -0,0 +1,71 @@
+---
+id: cpp-conditions-reallife
+title: "C++ If ... Else Examples"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["real-life if else", "even or odd example", "C++ 조건문 실전 예제"]
+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: ["cpp", "programming-language", "w3schools", "conditions", "real-life-example"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_conditions_reallife.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP If ... Else Examples]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The five worked scenarios (door code, positive/negative/zero, voting age, nested citizenship check, even/odd via `%`) mirror C's real-life if/else chapter almost verbatim — the sole notable omission is C's temperature-banding example, meaning this chapter consolidates the same core parity-check and equality-check idioms while trimming one example from the C original. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **This chapter is a compilation** — worked real-life if/else scenarios consolidating patterns from every prior Conditions sub-chapter. [S1]
+- **Door-code check** — a single `==` equality check gating access. [S1]
+- **Positive/negative/zero classification** — a three-way `if`/`else if`/`else` chain. [S1]
+- **Even/odd via modulus** — `num % 2 == 0` is the standard parity-check idiom, same as in C. [S1]
+
+## 📖 세부 내용 (Details)
+- Door code check: `int doorCode = 1337; if (doorCode == 1337) { cout << "Correct code.\nThe door is now open.\n"; } else { cout << "Wrong code.\nThe door remains closed.\n"; }`. [S1]
+- Positive/negative/zero: `int myNum = 10; if (myNum > 0) { cout << "The value is a positive number.\n"; } else if (myNum < 0) { cout << "The value is a negative number.\n"; } else { cout << "The value is 0.\n"; }`. [S1]
+- Even/odd check: `int myNum = 5; if (myNum % 2 == 0) { cout << myNum << " is even.\n"; } else { cout << myNum << " is odd.\n"; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
+
+## 🛠️ 적용 사례 (Applied in summary)
+도어락 코드 확인, 숫자 부호 판별, 투표 연령, 짝/홀수 판별 등이 원문에서 직접 제시되며, 각각이 조건문 섹션 전체를 종합한 실전 활용 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+The standard parity-check idiom using the modulus operator (C++):
+```cpp
+int myNum = 5;
+if (myNum % 2 == 0) {
+  cout << myNum << " is even.\n";
+} else {
+  cout << myNum << " is odd.\n";
+}
+```
+
+## ✅ 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:** [[CPP Conditions Nested]], [[CPP Operators Arithmetic]], [[CPP Switch]]
+- **참조 맥락:** 조건문 섹션 마지막 — switch 문(Switch) 섹션으로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ If ... Else Examples — https://www.w3schools.com/cpp/cpp_conditions_reallife.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ If ... Else Examples" page (Astra wiki-curation, P-Reinforce v3.1 format).