2nd/10_Wiki/Topics/Domain_Programming/Topic_C/C_Functions.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-functions	C Functions	Programming_Language	draft	conceptual		void function function call C 함수		B	0.86	2026-07-04	2026-07-04			c programming-language w3schools functions	https://www.w3schools.com/c/c_functions.php

C Functions

🎯 한 줄 통찰 (One-line insight)

The source reveals that main() and printf() — the two things every C beginner types on day one — are ALREADY functions, meaning the concept being "introduced" in this chapter isn't new at all; the learner has been using functions the entire tutorial without a name for it, and this chapter is really just formalizing vocabulary for a pattern already internalized. [S1]

🧠 핵심 개념 (Core concepts)

• Function — a block of code that only runs when explicitly CALLED, not automatically at declaration time. [S1]
• void return type — indicates the function returns no value (covered in more depth in the Parameters chapter). [S1]
• Declaration vs. execution timing — declaring a function only "saves it for later use"; nothing inside runs until it's called. [S1]
• Repeatable calls — the same function can be called multiple times, each execution independent. [S1]
• Code reuse motivation — "define the code once, and use it many times" is the core justification for functions. [S1]

📖 세부 내용 (Details)

• Calling the same function three times: void myFunction() { printf("I just got executed!"); } int main() { myFunction(); myFunction(); myFunction(); return 0; } — prints the message three times. [S1]
• A function performing a fixed calculation: void calculateSum() { int x = 5; int y = 10; int sum = x + y; printf("The sum of x + y is: %d", sum); } — explicitly noted as LIMITED since x/y are hardcoded, motivating the next chapter's parameters. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

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

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — main()과 printf() 자체가 이미 함수라는 사실을 상기시키는 것이 이 챕터의 핵심 실전 통찰이다. [S1]

💻 코드 패턴 (Code patterns)

Calling the same function multiple times (C):

void myFunction() {
  printf("I just got executed!");
}
int main() {
  myFunction();
  myFunction();
  myFunction();
  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: 0.86
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C Tutorial
• 관련 개념: C Memory RealLife, C Functions Decl
• 참조 맥락: 함수 섹션 첫 챕터 — 함수 선언과 정의(Functions Decl) 챕터로 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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