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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-pointers-arrays | C Pointers and Arrays | Programming_Language | draft | conceptual |
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B | 0.87 | 2026-07-04 | 2026-07-04 |
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C Pointers and Arrays
🎯 한 줄 통찰 (One-line insight)
An array's NAME already IS a pointer to its first element — proven directly by printing myNumbers and &myNumbers[0] and getting the IDENTICAL address — meaning *myNumbers (dereferencing the bare array name) works exactly like myNumbers[0], and the entire array-indexing syntax arr[i] is really syntactic sugar over pointer arithmetic (*(arr + i)) that's been running underneath the whole time. [S1]
🧠 핵심 개념 (Core concepts)
- Array name = pointer to first element —
myNumbersand&myNumbers[0]evaluate to the exact same address. [S1] *arrayName— dereferences the array's implicit pointer to get the FIRST element's value, equivalent toarrayName[0]. [S1]*(arrayName + i)— equivalent toarrayName[i]; offsetting the array-as-pointer byiand dereferencing reaches the same element as bracket indexing. [S1]- Mutation via dereference —
*myNumbers = 13;changes the first element just likemyNumbers[0] = 13;would. [S1] - Element memory layout confirms the size math — consecutive
intelements' addresses differ by exactlysizeof(int)(4 bytes), so an array of 4 ints occupies 16 bytes total. [S1]
📖 세부 내용 (Details)
- Proving array-name-equals-pointer:
printf("%p\n", myNumbers); printf("%p\n", &myNumbers[0]); // identical addresses. [S1] - Dereferencing the bare array name for the first element:
printf("%d", *myNumbers); // 25 (same as myNumbers[0]). [S1] - Offsetting to reach later elements:
printf("%d\n", *(myNumbers + 1)); // 50 printf("%d", *(myNumbers + 2)); // 75. [S1] - Mutating through dereference:
*myNumbers = 13; *(myNumbers + 1) = 17;changes the first and second elements. [S1]
⚖️ 모순 및 업데이트 (Contradictions & updates)
- 배열 이름은 이미 포인터: 배열 이름을 그대로 출력한 주소와 &배열[0]으로 얻은 주소가 완전히 동일하다는 점이 직접 증명되며, 이는 배열 인덱싱(arr[i])이 실제로는 포인터 연산(*(arr+i))의 편의 문법임을 시사함. [S1]
🛠️ 적용 사례 (Applied in summary)
대용량 배열이나 2차원 배열, 그리고 배열인 문자열(string)에 접근할 때 포인터 방식이 더 효율적이고 빠르다는 점이 원문에서 직접 언급됨. [S1]
💻 코드 패턴 (Code patterns)
An array's name and the address of its first element are identical (C):
int myNumbers[4] = {25, 50, 75, 100};
printf("%p\n", myNumbers); // e.g. 0x7ffe70f9d8f0
printf("%p\n", &myNumbers[0]); // same address: 0x7ffe70f9d8f0
printf("%d", *myNumbers); // 25, same as myNumbers[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: 0.87
- 중복 검사 결과: 신규 생성 (New discovery)
🔗 지식 그래프 (Knowledge Graph)
- 상위/루트: C Tutorial
- 관련 개념: C Pointers Arithmetic, C Pointer To Pointer, C Arrays Multi
- 참조 맥락: 포인터와 배열의 관계 — 포인터의 포인터(Pointer To Pointer) 챕터로 이어짐.
📚 출처 (Sources)
- [S1] W3Schools — C Pointers and Arrays — https://www.w3schools.com/c/c_pointers_arrays.php
📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C Pointers and Arrays" page (Astra wiki-curation, P-Reinforce v3.1 format).