2nd/10_Wiki/Topic_Programming/Topic_CSharp/CSharp_Variables_Display.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
csharp-variables-display	C# Display Variables	Programming_Language	draft	conceptual		string concatenation C# + operator overload C# C# 변수 출력		B	0.84	2026-07-04	2026-07-04			csharp programming-language w3schools variables concatenation	https://www.w3schools.com/cs/cs_variables_display.php

CSharp Display Variables

🎯 한 줄 통찰 (One-line insight)

C# overloads the SAME + operator to mean two entirely different operations depending on operand type — string concatenation ("Hello " + name) versus numeric addition (x + y) — with no separate concatenation operator like C++ chose to avoid (C++ ALSO overloads << for output but keeps + mostly numeric for its native strings, relying on std::string's own + overload); C# instead makes this dual-meaning + a first-class, chapter-one-visible feature, closer to Java's identical +-for-both-jobs design than to C++'s more type-segregated approach. [S1]

🧠 핵심 개념 (Core concepts)

• + for string + text combination — "Hello " + name concatenates a string literal and a string variable. [S1]
• + for string + string combination — firstName + lastName concatenates two string variables into a new string. [S1]
• + for numeric addition — when both operands are numeric (e.g. int), + performs mathematical addition instead of concatenation. [S1]
• Type determines behavior — the SAME operator symbol resolves to concatenation or addition purely based on the operand types involved. [S1]

📖 세부 내용 (Details)

• String + variable: string name = "John"; Console.WriteLine("Hello " + name);. [S1]
• Variable + variable (string): string firstName = "John "; string lastName = "Doe"; string fullName = firstName + lastName; Console.WriteLine(fullName);. [S1]
• Numeric addition: int x = 5; int y = 6; Console.WriteLine(x + y); // Print the value of x + y → outputs 11. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 동일 연산자가 타입에 따라 완전히 다른 동작을 함: +가 문자열이면 연결(concatenation), 숫자면 산술 덧셈이라는 이중 역할을 한다는 점이 이번 챕터에서 확인됨 — Java와 동일한 설계이며, C++가 std::string의 + 연산자 오버로드를 통해 유사하게 동작하지만 C#은 이를 변수 출력 챕터 초반부터 명시적으로 강조한다는 차이가 있음. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 이름 문자열을 인사말과 연결하고, 숫자 두 개를 더해 출력하는 두 예제가 원문에서 나란히 제시됨. [S1]

💻 코드 패턴 (Code patterns)

The + operator's dual meaning — concatenation vs. addition (C#):

string name = "John";
Console.WriteLine("Hello " + name);   // concatenation -> "Hello John"

int x = 5;
int y = 6;
Console.WriteLine(x + y);              // addition -> 11

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.84
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: C# Tutorial
• 관련 개념: CSharp Variables Constants, CSharp Variables Multiple, CSharp Strings Concat
• 참조 맥락: Variables 섹션 — Multiple Variables 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C# Display Variables — https://www.w3schools.com/cs/cs_variables_display.php

📝 변경 이력 (Change history)

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