2nd/10_Wiki/Topics/Domain_Programming/Topic_CPP/CPP_Break.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-break	C++ Break and Continue	Programming_Language	draft	conceptual		break statement continue statement loop control C++ break continue		B	0.84	2026-07-04	2026-07-04			cpp programming-language w3schools loops break continue	https://www.w3schools.com/cpp/cpp_break.asp

CPP Break and Continue

🎯 한 줄 통찰 (One-line insight)

The break-in-while example places i++ BEFORE the if (i == 4) break; check, deliberately different ordering from the continue-in-while example (which places i++ inside the if block before continue) — a subtle structural detail showing that where the increment sits relative to the break/continue check must be deliberately designed per-case to avoid either skipping a value or looping forever, unlike a for loop where the increment is guaranteed to run automatically regardless of continue. [S1]

🧠 핵심 개념 (Core concepts)

• break — stops the loop COMPLETELY. [S1]
• continue — skips the REST of the current iteration and jumps to the next one. [S1]
• Works in both for and while loops — same semantics apply regardless of loop type. [S1]
• Increment placement matters in while loops — unlike for loops (where the increment always runs), a while loop's increment must be manually placed correctly relative to continue, or the loop may infinite-loop or skip incorrectly. [S1]

📖 세부 내용 (Details)

• break stopping a for loop at i==4: for (int i = 0; i < 10; i++) { if (i == 4) { break; } cout << i << "\n"; } — prints 0,1,2,3 then stops entirely. [S1]
• continue skipping just one value: for (int i = 0; i < 10; i++) { if (i == 4) { continue; } cout << i << "\n"; } — prints 0,1,2,3,5,6,7,8,9. [S1]
• break in a while loop (increment BEFORE the break check): int i = 0; while (i < 10) { cout << i << "\n"; i++; if (i == 4) { break; } }. [S1]
• continue in a while loop (increment INSIDE the if, before continue, to avoid an infinite loop): int i = 0; while (i < 10) { if (i == 4) { i++; continue; } cout << i << "\n"; i++; }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• while 루프에서는 증가식 위치를 직접 설계해야 함: for 루프와 달리 while 루프는 증가식(i++)이 자동으로 실행되지 않으므로, continue를 쓸 때는 continue 이전에 반드시 i++을 넣어야 무한루프를 피할 수 있다는 점이 두 예제(break용/continue용)의 서로 다른 i++ 배치로 확인됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — while 루프에서 continue를 쓸 때 증가식을 continue 이전에 두어야 무한루프를 방지한다는 점이 실전 디버깅에서 흔히 놓치는 함정으로 시사된다. [S1]

💻 코드 패턴 (Code patterns)

Placing the increment before continue in a while loop to avoid an infinite loop (C++):

int i = 0;
while (i < 10) {
  if (i == 4) {
    i++;      // must increment before continue
    continue;
  }
  cout << i << "\n";
  i++;
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.84
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C++ Tutorial
• 관련 개념: CPP For Loop RealLife, CPP Switch, CPP Arrays
• 참조 맥락: 반복문 섹션 마지막 — 배열(Arrays) 섹션으로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C++ Break and Continue — https://www.w3schools.com/cpp/cpp_break.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "C++ Break and Continue" page (Astra wiki-curation, P-Reinforce v3.1 format).