2nd/10_Wiki/Dev/Topic_CPP/CPP_Do_While_Loop.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
cpp-do-while-loop	C++ Do/While Loop	Programming_Language	draft	conceptual		do while at-least-once loop C++ do-while 반복문		B	0.85	2026-07-04	2026-07-04			cpp programming-language w3schools loops do-while	https://www.w3schools.com/cpp/cpp_do_while_loop.asp

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++):

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).