2nd/10_Wiki/Topic_Programming/Topic_C/C_Structs_Nested.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
c-structs-nested	C Nested Structures	Programming_Language	draft	conceptual		struct inside struct layered data C 중첩 구조체		B	0.85	2026-07-04	2026-07-04			c programming-language w3schools structs nested-structs	https://www.w3schools.com/c/c_structs_nested.php

C Nested Structures

🎯 한 줄 통찰 (One-line insight)

Accessing a nested struct's member requires CHAINING dot syntax (car1.owner.firstName) rather than a single dot — each additional layer of nesting adds one more . hop, meaning the access path itself mirrors the data's logical hierarchy exactly (car → owner → firstName), making deeply nested structures self-documenting about their own structure just from how you reach a value. [S1]

🧠 핵심 개념 (Core concepts)

• Nested structure — a struct that contains ANOTHER struct as one of its members, useful for grouping related data in layers. [S1]
• Chained dot access — reaching a nested member requires one . per layer of nesting (car1.owner.firstName, not a shortcut). [S1]
• Composition over flattening — instead of cramming an owner's first/last name directly into the Car struct, a separate Owner struct is composed INTO Car, keeping each struct focused on one concept. [S1]

📖 세부 내용 (Details)

• Defining and nesting: struct Owner { char firstName[30]; char lastName[30]; }; struct Car { char brand[30]; int year; struct Owner owner; };. [S1]
• Initializing a nested struct by passing an already-built inner struct as one field: struct Owner person = {"John", "Doe"}; struct Car car1 = {"Toyota", 2010, person};. [S1]
• Chained access to reach the innermost value: printf("Owner: %s %s\n", car1.owner.firstName, car1.owner.lastName);. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

자동차(Car) 구조체 안에 소유자(Owner) 구조체를 중첩시켜 자동차와 소유자 정보를 계층적으로 묶는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Chained dot-access to reach a value inside a nested struct (C):

struct Owner {
  char firstName[30];
  char lastName[30];
};
struct Car {
  char brand[30];
  int year;
  struct Owner owner; // Nested structure
};
int main() {
  struct Owner person = {"John", "Doe"};
  struct Car car1 = {"Toyota", 2010, person};
  printf("Owner: %s %s\n", car1.owner.firstName, car1.owner.lastName);
  return 0;
}

✅ 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 Structs, C Structs Padding
• 참조 맥락: 중첩 구조체 — 구조체 정렬/패딩(Structs Padding) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C Nested Structures — https://www.w3schools.com/c/c_structs_nested.php

📝 변경 이력 (Change history)

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