---
id: c-arrays-multi
title: "C Multidimensional Arrays"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["2D array", "matrix", "3D array", "C 다차원 배열"]
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", "arrays", "multidimensional"]
raw_sources: ["https://www.w3schools.com/c/c_arrays_multi.php"]
applied_in: []
github_commit: ""
---

# [[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):
```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).