docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합

이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영.

- Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들
  (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거.
- Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/
  Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/
  Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이
  존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존).
- Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/
  JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동.
- 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리.
- Topic_Programming 최종 문서 수: 2784 → 3985.

10_Wiki/Topic_Programming/Topic_C/C_Functions_Decl.md

@@ -0,0 +1,83 @@
+---
+id: c-functions-decl
+title: "C Function Declaration and Definition"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["function prototype", "forward declaration", "C 함수 선언과 정의"]
+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: ["c", "programming-language", "w3schools", "functions", "function-declaration"]
+raw_sources: ["https://www.w3schools.com/c/c_functions_decl.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[C Function Declaration and Definition]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Separating a function's DECLARATION (name/return-type/parameters) from its DEFINITION (actual body) is what allows `main()` to call a function that's physically written BELOW it in the source file — without a forward declaration above `main()`, the compiler would encounter the function call before ever having seen what that function even looks like, since C reads files top to bottom. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Declaration** — the function's name, return type, and parameters ONLY, ending in a semicolon (`void myFunction();`), with no body. [S1]
+- **Definition** — the function's actual body/implementation. [S1]
+- **Recommended file layout** — declarations placed ABOVE `main()`, definitions placed BELOW `main()`, for organization and readability. [S1]
+- **Enables forward reference** — a function can be called from `main()` even though its full definition appears later in the file, as long as its declaration appeared earlier. [S1]
+- **Functions calling other functions** — as long as both are DECLARED first, one function's body can call another function that's defined elsewhere in the file. [S1]
+
+## 📖 세부 내용 (Details)
+- Declaration-above, definition-below pattern: `void myFunction(); int main() { myFunction(); return 0; } void myFunction() { printf("I just got executed!"); }`. [S1]
+- Same pattern with parameters and a return value: `int myFunction(int x, int y); int main() { int result = myFunction(5, 3); ... } int myFunction(int x, int y) { return x + y; }`. [S1]
+- One function calling another, both pre-declared: `void myFunction(); void myOtherFunction(); int main() { myFunction(); return 0; } void myFunction() { printf("Some text in myFunction\n"); myOtherFunction(); } void myOtherFunction() { printf("Hey! Some text in myOtherFunction\n"); }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 함수 선언을 main() 위에, 정의를 아래에 두는 구조가 대부분의 C 프로그램에서 표준적으로 쓰이는 코드 조직 방식이라고 원문에 명시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Declaring functions above main() and defining them below, allowing one to call the other (C):
+```c
+// Function declarations
+void myFunction();
+void myOtherFunction();
+
+int main() {
+  myFunction();
+  return 0;
+}
+
+// Function definitions
+void myFunction() {
+  printf("Some text in myFunction\n");
+  myOtherFunction(); // calling another function
+}
+void myOtherFunction() {
+  printf("Hey! Some text in myOtherFunction\n");
+}
+```
+
+## ✅ 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:** [[C Functions]], [[C Functions Parameters]]
+- **참조 맥락:** 함수 선언과 정의 — 함수 매개변수(Functions Parameters) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C Function Declaration and Definition — https://www.w3schools.com/c/c_functions_decl.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C Function Declaration and Definition" page (Astra wiki-curation, P-Reinforce v3.1 format).