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10_Wiki/Topic_Programming/Topic_CPP/CPP_Classes.md

@@ -0,0 +1,80 @@
+---
+id: cpp-classes
+title: "C++ Classes and Objects"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["class keyword", "public access specifier", "attributes", "C++ 클래스와 객체"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["cpp", "programming-language", "w3schools", "oop", "classes"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_classes.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Classes and Objects]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A C++ class LOOKS almost identical to a C struct at first glance — variables grouped inside curly braces, accessed via dot syntax, ending in a semicolon — but requires ONE extra piece C's struct never needed: the `public:` access specifier, meaning without it, class members would default to being INACCESSIBLE from outside the class, a private-by-default behavior structs don't have. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Class** — a user-defined data type; a "blueprint" for creating objects; variables inside are called ATTRIBUTES, functions are called METHODS (collectively "class members"). [S1]
+- **`class` keyword** — creates a class, e.g. `class MyClass { ... };` — ending with a semicolon, just like a struct. [S1]
+- **`public:` access specifier** — REQUIRED for members to be accessible from outside the class (covered in more depth in a later chapter). [S1]
+- **Creating an object** — `MyClass myObj;` instantiates the class; attributes are accessed via dot syntax (`myObj.myNum`). [S1]
+- **Multiple objects from one class** — each object maintains its OWN independent set of attribute values. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic class with public attributes: `class MyClass { public: int myNum; string myString; };`. [S1]
+- Creating an object and setting/reading attributes: `MyClass myObj; myObj.myNum = 15; myObj.myString = "Some text"; cout << myObj.myNum;`. [S1]
+- Two independent objects of the same class: `Car carObj1; carObj1.brand = "BMW"; Car carObj2; carObj2.brand = "Ford";` — each object's `brand` is stored separately. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **public 접근 지정자가 필수적으로 요구됨**: C의 struct와 겉모습은 비슷하지만, C++ 클래스는 멤버를 클래스 외부에서 접근하려면 public: 접근 지정자를 명시해야 한다는 점이 확인됨(기본은 private) — 이는 다음 섹션(Access Specifiers)에서 더 자세히 다뤄짐. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+Car 클래스 하나로 BMW와 Ford 두 대의 서로 다른 자동차 객체를 만드는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+A class with public attributes, instantiated as two independent objects (C++):
+```cpp
+class Car {
+public:
+  string brand;
+  string model;
+  int year;
+};
+int main() {
+  Car carObj1;
+  carObj1.brand = "BMW";
+  Car carObj2;
+  carObj2.brand = "Ford";
+  cout << carObj1.brand << "\n" << carObj2.brand;
+  return 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:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C++ Tutorial]]
+- **관련 개념:** [[CPP OOP]], [[CPP Class Methods]], [[C Structs]]
+- **참조 맥락:** 클래스와 객체 — 클래스 메서드(Class Methods) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Classes and Objects — https://www.w3schools.com/cpp/cpp_classes.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Classes and Objects" page (Astra wiki-curation, P-Reinforce v3.1 format).