2nd/10_Wiki/Topics/Domain_Programming/Topic_C/C_Arrays.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	C Arrays	Programming_Language	draft	conceptual		array declaration fixed-size array C 배열		B	0.86	2026-07-04	2026-07-04			c programming-language w3schools arrays	https://www.w3schools.com/c/c_arrays.php

C Arrays

🎯 한 줄 통찰 (One-line insight)

Mixing types in an array literal (int myArray[] = {25, 50, 75, 3.15, 5.99};) doesn't always fail loudly — the source shows the float values 3.15/5.99 get silently TRUNCATED to 3/5 (since the array is typed int), and only "in some cases" does it produce an error, meaning the type-mismatch guard here is a silent-data-loss trap more often than a hard compile failure. [S1]

🧠 핵심 개념 (Core concepts)

• Array literal creation — type name[] = {val1, val2, ...}; creates and initializes an array in one step. [S1]
• Zero-based indexing — [0] is the first element, [1] the second, and so on. [S1]
• Mutable elements — any element can be reassigned by index after creation (myNumbers[0] = 33;). [S1]
• Size-first declaration — int myNumbers[4]; reserves space for 4 elements to be filled in later; the SIZE CANNOT CHANGE after creation. [S1]
• Same-type requirement — all elements must share one data type; mismatched types get silently truncated/converted, not cleanly rejected. [S1]

📖 세부 내용 (Details)

• Literal array creation and access: int myNumbers[] = {25, 50, 75, 100}; printf("%d", myNumbers[0]); // 25. [S1]
• Modifying an element by index: myNumbers[0] = 33; // Now outputs 33 instead of 25. [S1]
• Size-first, fill-later declaration: int myNumbers[4]; myNumbers[0] = 25; myNumbers[1] = 50; myNumbers[2] = 75; myNumbers[3] = 100;. [S1]
• Type-mismatch truncation trap: int myArray[] = {25, 50, 75, 3.15, 5.99}; — 3.15 and 5.99 silently become 3 and 5. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 타입이 섞이면 조용히 잘림: int 배열에 float 값을 넣으면 항상 에러가 나는 게 아니라 대부분 소수점이 잘려나가는 형태로 조용히 처리되며, 일부 경우에만 에러가 발생한다는 점이 명시적으로 경고됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 크기를 먼저 선언하고 나중에 요소를 채우는 방식이 데이터가 순차적으로 들어올 때(예: 사용자 입력 반복) 실전에서 활용된다. [S1]

💻 코드 패턴 (Code patterns)

Declaring an array's size first, then filling in elements later (C):

int myNumbers[4];
myNumbers[0] = 25;
myNumbers[1] = 50;
myNumbers[2] = 75;
myNumbers[3] = 100;

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.86
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C Tutorial
• 관련 개념: C Break Continue, C Arrays Size
• 참조 맥락: 배열 섹션 첫 챕터 — 배열 크기(Arrays Size) 챕터로 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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