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10_Wiki/Dev/Topic_CPP/CPP_Operators_Arithmetic.md

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+---
+id: cpp-operators-arithmetic
+title: "C++ Arithmetic Operators"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["integer division", "increment decrement", "C++ 산술 연산자"]
+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", "operators", "arithmetic"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_operators_arithmetic.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[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 `int`s 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++):
+```cpp
+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).