2nd/10_Wiki/Dev/Topic_C/C_Arrays_Multi.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-arrays-multi	C Multidimensional Arrays	Programming_Language	draft	conceptual		2D array matrix 3D array C 다차원 배열		B	0.85	2026-07-04	2026-07-04			c programming-language w3schools arrays multidimensional	https://www.w3schools.com/c/c_arrays_multi.php

C Multidimensional Arrays

🎯 한 줄 통찰 (One-line insight)

A multidimensional array is defined as literally "an array of arrays," and this compounds directly into the looping requirement: an N-dimensional array needs exactly N nested loops to visit every element — a 2D array needs 2 nested loops (as shown), a 3D array would need 3 — meaning the loop-nesting depth isn't a stylistic choice but a direct structural consequence of how many dimensions the array has. [S1]

🧠 핵심 개념 (Core concepts)

• Multidimensional array — "basically an array of arrays"; C supports any number of dimensions, with 2D being the most common. [S1]
• 2D array (type name[rows][cols]) — a matrix/table; first bracket = row count, second bracket = column count. [S1]
• Dual-index access — matrix[row][col] addresses a specific cell; both indices are zero-based. [S1]
• One nested loop per dimension — looping a 2D array fully requires 2 nested loops (outer for rows, inner for columns); a 3D array would require 3 nested loops. [S1]
• 3D arrays (type name[blocks][rows][cols]) — represent structures like multiple tables or game levels, each block itself being a 2D array. [S1]

📖 세부 내용 (Details)

• Creating and accessing a 2D array: int matrix[2][3] = { {1, 4, 2}, {3, 6, 8} }; printf("%d", matrix[0][2]); // Outputs 2. [S1]
• Modifying a specific cell: matrix[0][0] = 9; // Now outputs 9 instead of 1. [S1]
• Fully looping a 2D array with nested loops: for (i = 0; i < 2; i++) { for (j = 0; j < 3; j++) { printf("%d\n", matrix[i][j]); } }. [S1]
• Declaring a 3D array (2 blocks × 4 rows × 3 columns): int example[2][4][3];. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 차원 수와 중첩 루프 개수의 직접 대응: 2차원 배열은 중첩 루프 2개, 3차원 배열은 중첩 루프 3개가 필요하다는 구조적 대응 관계가 명시적으로 확인됨. [S1]

🛠️ 적용 사례 (Applied in summary)

2D 배열은 점수표, 게임판, 스프레드시트에, 3D 배열은 여러 테이블의 집합이나 게임의 여러 레벨 같은 복잡한 구조 표현에 적합하다고 원문에서 직접 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Fully iterating a 2D array requires one nested loop per dimension (C):

int matrix[2][3] = { {1, 4, 2}, {3, 6, 8} };
int i, j;
for (i = 0; i < 2; i++) {
  for (j = 0; j < 3; j++) {
    printf("%d\n", matrix[i][j]);
  }
}

✅ 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 Arrays Loop, C For Loop Nested, C Arrays RealLife
• 참조 맥락: 다차원 배열 — 배열 실전 예제(Arrays RealLife) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C Multidimensional Arrays — https://www.w3schools.com/c/c_arrays_multi.php

📝 변경 이력 (Change history)

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