2nd/10_Wiki/Dev/Topic_CPP/CPP_Operators_Arithmetic.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-operators-arithmetic	C++ Arithmetic Operators	Programming_Language	draft	conceptual		integer division increment decrement C++ 산술 연산자		B	0.85	2026-07-04	2026-07-04			cpp programming-language w3schools operators arithmetic	https://www.w3schools.com/cpp/cpp_operators_arithmetic.asp

CPP Arithmetic Operators

🎯 한 줄 통찰 (One-line insight)

Integer division truncation carries over from C completely unchanged — 10 / 3 still yields 3 in C++, and the fix is identical too (use double operands: 10.0 / 3 gives 3.333...) — confirming that C++'s arithmetic semantics for the basic numeric types are inherited from C wholesale, not just its syntax. [S1]

🧠 핵심 개념 (Core concepts)

• Seven core arithmetic operators — +, -, *, /, % (modulus), ++ (increment), -- (decrement) — identical set to C. [S1]
• Integer division truncation — dividing two ints always yields an int, discarding any decimal remainder; use double operands for a decimal result. [S1]
• Increment/decrement round-trip — incrementing then decrementing the same variable returns it to its original value. [S1]

📖 세부 내용 (Details)

• All seven operators demonstrated with chained cout output: int x = 10; int y = 3; cout << (x + y) << "\n"; // 13 ... cout << (x % y) << "\n"; // 1. [S1]
• Integer vs decimal division contrast: int x = 10; int y = 3; cout << (x / y); // 3 (integer division) versus double a = 10.0; double b = 3.0; cout << (a / b); // 3.333.... [S1]
• Real-life counting example: int peopleInRoom = 0; peopleInRoom++; peopleInRoom++; peopleInRoom++; // 3 people enter cout << peopleInRoom; // 3 then peopleInRoom--; // 2. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• C와 완전히 동일한 정수 나눗셈 절삭: int끼리 나누면 소수점이 버려진다는 점과 그 해결책(double 사용)이 C 챕터와 동일하게 확인됨. [S1]

🛠️ 적용 사례 (Applied in summary)

방에 들어오고 나가는 사람 수를 ++/--로 세는 카운터 예제가 원문에서 직접 실전 활용 사례로 제시됨(C 챕터와 동일한 예제). [S1]

💻 코드 패턴 (Code patterns)

Integer division truncates; use double operands for a decimal result (C++):

int x = 10;
int y = 3;
cout << (x / y); // Integer division, result is 3

double a = 10.0;
double b = 3.0;
cout << (a / b); // Decimal division, result is 3.333...

✅ 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 Operators, CPP Operators Assignment, C Operators Arithmetic
• 참조 맥락: 산술 연산자 — 대입 연산자(Operators Assignment) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C++ Arithmetic Operators — https://www.w3schools.com/cpp/cpp_operators_arithmetic.asp

📝 변경 이력 (Change history)

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