docs(10_Wiki): 위키 구조 정리 — 언어 튜토리얼 카테고리 폴더 제거 + 신규 자산 동기화

Topic_CSS/Topic_HTML/Topic_JavaScript/Topic_Prompt/Topic_Comfyui 등 기존 카테고리 폴더를 정리하고, Topic_Graphic/Dev 등 신규 산출물과 Topics 내부 세션/메모리 기록을 동기화.
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+---
+id: c-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: 0.86
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["c", "programming-language", "w3schools", "operators", "arithmetic"]
+raw_sources: ["https://www.w3schools.com/c/c_operators_arithmetic.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[C Arithmetic Operators]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Dividing two `int` values ALWAYS produces an `int` result, silently truncating any decimal — `10 / 3` gives `3`, not `3.33` — and the ONLY way to get a decimal result is to make at least the operand types `float`/`double` (`10.0 / 3` gives `3.333...`), meaning integer division isn't a rounding behavior to configure, it's an unavoidable consequence of the operand types chosen. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Seven core arithmetic operators** — `+` (add), `-` (subtract), `*` (multiply), `/` (divide), `%` (modulus/remainder), `++` (increment), `--` (decrement). [S1]
+- **Integer division truncation** — dividing two `int`s always yields an `int`, discarding any decimal remainder; use `float`/`double` operands to get a decimal result. [S1]
+- **Increment/decrement round-trip** — incrementing then decrementing the same variable (or vice versa) returns it to its original value. [S1]
+
+## 📖 세부 내용 (Details)
+- All seven operators demonstrated together: `int x = 10; int y = 3; x + y; // 13`, `x - y; // 7`, `x * y; // 30`, `x / y; // 3`, `x % y; // 1`, plus `++z`/`--z` on a separate variable. [S1]
+- Integer vs decimal division contrast: `int a = 10; int b = 3; printf("%d\n", a / b); // 3 (integer division)` versus `double c = 10.0; double d = 3.0; printf("%f\n", c / d); // 3.333...`. [S1]
+- Real-life counting example: `int peopleInRoom = 0; peopleInRoom++; peopleInRoom++; peopleInRoom++; // 3 people enter, count = 3` then `peopleInRoom--; // 1 leaves, count = 2`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **정수 나눗셈의 소수점 절삭**: int끼리 나누면 항상 int 결과가 나와 소수점이 버려진다는 점이 명시되며, 소수 결과를 원하면 최소 한쪽을 float/double로 만들어야 한다는 해결책이 함께 제시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+방에 들어오고 나가는 사람 수를 ++/--로 세는 카운터 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Integer division truncates; use float/double operands for a decimal result (C):
+```c
+int a = 10;
+int b = 3;
+printf("%d\n", a / b); // Integer division, result is 3
+
+double c = 10.0;
+double d = 3.0;
+printf("%f\n", c / d); // 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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C Tutorial]]
+- **관련 개념:** [[C Operators]], [[C Operators Assignment]]
+- **참조 맥락:** 산술 연산자 — 대입 연산자(Operators Assignment) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C Arithmetic Operators — https://www.w3schools.com/c/c_operators_arithmetic.php
+
+## 📝 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).