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82 lines
4.4 KiB
Markdown
82 lines
4.4 KiB
Markdown
---
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id: csharp-booleans
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title: "C# Booleans"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["bool data type C#", "boolean expressions C#", "C# 불리언"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.83
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["csharp", "programming-language", "w3schools", "booleans"]
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raw_sources: ["https://www.w3schools.com/cs/cs_booleans.php"]
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applied_in: []
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github_commit: ""
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---
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# [[CSharp Booleans]]
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## 🎯 한 줄 통찰 (One-line insight)
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This chapter previews the if...else statement (voting-age example) BEFORE the Conditions section formally covers it, which is a deliberate pedagogical sequencing choice — showing WHY boolean expressions matter (they're the direct input to `if`) before teaching the `if` syntax itself — and the example itself reuses `Console.WriteLine(myAge >= votingAge);` printing a raw `True`/`False` before wrapping the identical comparison inside an `if {} else {}` block, making the connection between "a boolean expression" and "a branching decision" explicit and concrete rather than assumed. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`bool`** — a type that can only hold `true` or `false`, used for binary-state situations (yes/no, on/off). [S1]
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- **Boolean expression** — an expression (typically built with comparison operators) that itself evaluates to `True`/`False`, e.g. `x > y`, `x == 10`. [S1]
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- **Direct literal comparison** — comparisons work on literals too, not just variables: `Console.WriteLine(10 > 9);` is valid on its own. [S1]
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- **Boolean expressions are the foundation of `if`/`else`** — the tutorial explicitly states "the boolean value of an expression is the basis for all C# comparisons and conditions." [S1]
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## 📖 세부 내용 (Details)
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- Direct declaration: `bool isCSharpFun = true; bool isFishTasty = false;` — printed as `True`/`False`. [S1]
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- Comparison-derived booleans: `int x = 10; int y = 9; Console.WriteLine(x > y); // True`; `Console.WriteLine(x == 10); // True`; `Console.WriteLine(10 == 15); // False`. [S1]
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- Real-life voting-age example, first as a bare boolean print: `int myAge = 25; int votingAge = 18; Console.WriteLine(myAge >= votingAge);` → `True`. [S1]
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- The SAME comparison then wrapped in a full if/else:
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```
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if (myAge >= votingAge) { Console.WriteLine("Old enough to vote!"); }
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else { Console.WriteLine("Not old enough to vote."); }
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```
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[S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **if/else 문법이 정식 챕터 전에 미리 사용됨**: Conditions 섹션에서 if...else를 formal하게 다루기 전에, 이 챕터가 투표 연령 예제를 통해 if/else 구문을 먼저 보여준다는 점이 확인됨 — "왜 boolean 표현식이 중요한가(if의 입력이기 때문)"를 문법을 가르치기 전에 개념적으로 먼저 연결하려는 의도적 구성. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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투표 가능 연령(18세)과 실제 나이(25세)를 비교해 먼저 bool 값을 출력하고, 그다음 동일 비교를 if...else로 감싸 "Old enough to vote!" 또는 "Not old enough to vote."를 출력하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Boolean expression as a bare print, then wrapped in if/else (C#):
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```csharp
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int myAge = 25;
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int votingAge = 18;
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Console.WriteLine(myAge >= votingAge); // bare boolean -> True
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if (myAge >= votingAge) {
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Console.WriteLine("Old enough to vote!");
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} else {
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Console.WriteLine("Not old enough to vote.");
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.83
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[C# Tutorial]]
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- **관련 개념:** [[CSharp Strings Chars]], [[CSharp Conditions]], [[CSharp Operators Comparison]]
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- **참조 맥락:** Booleans 섹션의 유일 챕터 — Conditions 섹션으로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C# Booleans — https://www.w3schools.com/cs/cs_booleans.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C# Booleans" page (Astra wiki-curation, P-Reinforce v3.1 format).
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