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10_Wiki/Dev/Topic_CPP/CPP_Do_While_Loop.md

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+---
+id: cpp-do-while-loop
+title: "C++ Do/While Loop"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["do while", "at-least-once loop", "C++ do-while 반복문"]
+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", "loops", "do-while"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_do_while_loop.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Do/While Loop]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+This chapter explicitly flags something C's equivalent never called out as its own note: "the semicolon after the while condition is required!" — a small but real syntax trap, since `do {...} while(condition)` LOOKS like it should end like a regular `while` loop (no trailing semicolon), but the `do/while` FORM specifically requires one, unlike every other loop and conditional block in C++. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`do { ... } while (condition);`** — executes the block ONCE unconditionally, then checks the condition. [S1]
+- **Required trailing semicolon** — unlike `while(...) {...}` or `if(...) {...}`, the `do/while` form's closing `while(condition)` MUST end with a semicolon. [S1]
+- **Guaranteed first execution** — runs at least once even if the condition is false immediately. [S1]
+- **Input-validation pattern** — repeatedly prompting via `cin >>` until the loop condition fails. [S1]
+
+## 📖 세부 내용 (Details)
+- Standard case with the required semicolon: `int i = 0; do { cout << i << "\n"; i++; } while (i < 5);`. [S1]
+- Guaranteed-once case (condition false at start): `int i = 10; do { cout << "i is " << i << "\n"; i++; } while (i < 5);` — still prints once. [S1]
+- Practical input-validation loop: `int number; do { cout << "Enter a positive number: "; cin >> number; } while (number > 0);`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **do/while 뒤에는 반드시 세미콜론 필요**: while(condition) 뒤에 세미콜론을 빠뜨리기 쉬운 문법적 함정이 있다는 점이 C 챕터에는 없던 별도 주의사항으로 명시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+사용자로부터 양수를 입력받되 0이나 음수가 입력될 때까지 반복해서 물어보는 입력 검증 루프가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+The required trailing semicolon after a do/while loop's condition (C++):
+```cpp
+int i = 0;
+do {
+  cout << i << "\n";
+  i++;
+}
+while (i < 5); // semicolon required here
+```
+
+## ✅ 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 While Loop RealLife]], [[CPP For Loop]], [[C Do While Loop]]
+- **참조 맥락:** while 루프의 변형 — for 루프(For Loop) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Do/While Loop — https://www.w3schools.com/cpp/cpp_do_while_loop.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Do/While Loop" page (Astra wiki-curation, P-Reinforce v3.1 format).