2nd/10_Wiki/Dev/Topic_C/C_Booleans.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-booleans	C Booleans	Programming_Language	draft	conceptual		bool type stdbool.h C 불리언		B	0.86	2026-07-04	2026-07-04			c programming-language w3schools booleans stdbool	https://www.w3schools.com/c/c_booleans.php

C Booleans

🎯 한 줄 통찰 (One-line insight)

bool is NOT a built-in C type like int or char — it was only added in C99 and requires explicitly including <stdbool.h>, meaning code written for older/stricter C standards, or code that forgets this include, has no bool keyword at all and must fall back to plain int with 1/0 conventions instead. [S1]

🧠 핵심 개념 (Core concepts)

• bool (C99+, via <stdbool.h>) — a type representing exactly two values: true or false. [S1]
• Underlying integer representation — booleans print as integers: 1 (or any non-zero) for true, 0 for false, using the %d specifier. [S1]
• Bool-to-bool comparison — bool variables can be compared with == just like any other value (e.g. checking if two bools are both true). [S1]
• Storing comparison results — a comparison's result (already a 1/0 value) can be stored directly in a bool variable for readability and reuse. [S1]

📖 세부 내용 (Details)

• Declaring and printing bools: bool isProgrammingFun = true; bool isFishTasty = false; printf("%d", isProgrammingFun); // 1 printf("%d", isFishTasty); // 0. [S1]
• Comparing two bool variables: bool isHamburgerTasty = true; bool isPizzaTasty = true; printf("%d", isHamburgerTasty == isPizzaTasty); // 1. [S1]
• Storing a comparison result in a bool: int x = 10; int y = 9; bool isGreater = x > y; printf("%d", isGreater); // 1. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• bool은 C의 내장 타입이 아님: int나 char와 달리 bool은 C99에서 도입되었고 반드시 <stdbool.h>를 포함해야 사용 가능하다는 점이 명시적으로 강조됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 비교 결과를 bool 변수에 저장해 재사용하는 것이 코드 가독성을 높이는 실전 습관으로 권장된다. [S1]

💻 코드 패턴 (Code patterns)

Storing a comparison's result in a bool variable for readability (C):

#include <stdbool.h>
int x = 10;
int y = 9;
bool isGreater = x > y;
printf("%d", isGreater); // Prints 1 (true)

✅ 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 Random Numbers, C Operators Comparison, C Booleans RealLife
• 참조 맥락: 불리언 섹션 첫 챕터 — 불리언 실전 예제(Booleans RealLife) 챕터로 이어짐.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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