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76 lines
4.0 KiB
Markdown
76 lines
4.0 KiB
Markdown
---
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id: csharp-variables
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title: "C# Variables"
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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: ["int double char string bool", "C# 변수"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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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", "variables"]
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raw_sources: ["https://www.w3schools.com/cs/cs_variables.php"]
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applied_in: []
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github_commit: ""
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---
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# [[CSharp Variables]]
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## 🎯 한 줄 통찰 (One-line insight)
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C#'s five introductory types (int/double/char/string/bool) match Java's primitive-plus-String lineup almost exactly, but `string` in C# is a genuine built-in keyword-level type from the very first variable chapter — no separate library import, no `<string>` header, no `std::string` namespace qualifier — collapsing what took C an entire "no native strings" caveat and C++ a dedicated Strings section (`<string>` header, `std::string` vs C-style char arrays) into a single bullet point alongside int/double/char/bool. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`int`** — whole numbers without decimals (e.g. `123`, `-123`). [S1]
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- **`double`** — floating-point numbers with decimals (e.g. `19.99`, `-19.99`). [S1]
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- **`char`** — a single character, surrounded by SINGLE quotes (`'a'`). [S1]
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- **`string`** — text, surrounded by DOUBLE quotes (`"Hello World"`) — a first-class type from the start, not a library add-on. [S1]
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- **`bool`** — two states only: `true` or `false`. [S1]
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- **Declaration syntax** — `type variableName = value;`; can also declare without initializing, then assign later (`int myNum; myNum = 15;`). [S1]
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- **Reassignment overwrites** — assigning a new value to an existing variable replaces the old one silently (no warning). [S1]
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## 📖 세부 내용 (Details)
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- String declaration + print: `string name = "John"; Console.WriteLine(name);`. [S1]
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- Int declaration + print: `int myNum = 15; Console.WriteLine(myNum);`. [S1]
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- Declare-then-assign: `int myNum; myNum = 15; Console.WriteLine(myNum);`. [S1]
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- Overwrite: `int myNum = 15; myNum = 20; // myNum is now 20`. [S1]
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- All five types declared together: `int myNum = 5; double myDoubleNum = 5.99D; char myLetter = 'D'; bool myBool = true; string myText = "Hello";` — note the `D` suffix on the double literal. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **string이 처음부터 내장 타입으로 취급됨**: C는 문자열이라는 내장 타입 자체가 없어 char 배열로 흉내내야 했고, C++는 `<string>` 헤더와 `std::string`을 별도로 배워야 했지만, C#은 첫 변수 챕터부터 int/double/char/bool과 동일한 급으로 string을 나열한다는 점이 확인됨 — 별도 import나 네임스페이스 한정자 없이 바로 사용 가능. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — name(string)과 myNum(int) 변수를 선언하고 출력하는 기본 예제가 원문에서 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Declaring all five basic C# types (C#):
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```csharp
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int myNum = 5;
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double myDoubleNum = 5.99D;
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char myLetter = 'D';
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bool myBool = true;
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string myText = "Hello";
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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:** 0.85
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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 Variables Identifiers]], [[CSharp Data Types]], [[CPP Strings]], [[C Strings]]
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- **참조 맥락:** Variables 섹션 — Identifiers 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C# Variables — https://www.w3schools.com/cs/cs_variables.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C# Variables" page (Astra wiki-curation, P-Reinforce v3.1 format).
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