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title

C Logical Operators

🎯 한 줄 통찰 (One-line insight)

The login-check example combines a comparison-like value (isLoggedIn) with its NEGATION (!isAdmin) inside a single && expression (isLoggedIn && !isAdmin = "regular user") — showing that logical operators aren't just for combining two independent conditions, but are routinely used to express compound business rules like "authenticated AND NOT privileged" as one evaluable expression. [S1]

🧠 핵심 개념 (Core concepts)

&& (AND) — returns 1 only if BOTH operands are true. [S1]
|| (OR) — returns 1 if AT LEAST ONE operand is true. [S1]
! (NOT) — reverses the result: 1 becomes 0, 0 becomes 1. [S1]
1 = true, 0 = false — the same convention as Comparison Operators; logical operators combine these int-valued truth results. [S1]

📖 세부 내용 (Details)

Login/permission check combining AND and NOT: int isLoggedIn = 1; int isAdmin = 0; printf("Regular user: %d\n", isLoggedIn && !isAdmin); printf("Has access: %d\n", isLoggedIn || isAdmin); printf("Not logged in: %d\n", !isLoggedIn); — outputs 1, 1, 0 respectively. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

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

🛠️ 적용 사례 (Applied in summary)

로그인 여부와 관리자 권한을 조합해 "일반 사용자인지", "접근 권한이 있는지"를 판단하는 예제가 원문에서 직접 실전 활용 사례로 제시됨(인증/인가 로직의 기초). [S1]

💻 코드 패턴 (Code patterns)

Combining AND and NOT to express a compound access-control rule (C):

int isLoggedIn = 1;
int isAdmin = 0;
printf("Regular user: %d\n", isLoggedIn && !isAdmin); // 1
printf("Has access: %d\n", isLoggedIn || isAdmin);    // 1
printf("Not logged in: %d\n", !isLoggedIn);           // 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: 0.85
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: C Tutorial
관련 개념: C Operators Comparison, C Bitwise Operators, C Conditions Logical
참조 맥락: 논리 연산자 — 비트 연산자(Bitwise Operators) 챕터로 이어짐, 조건문의 논리 연산(Conditions Logical) 챕터와 직접 연결.

📚 출처 (Sources)

[S1] W3Schools — C Logical Operators — https://www.w3schools.com/c/c_operators_logical.php

📝 변경 이력 (Change history)

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

3.3 KiB Raw Blame History