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title

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++):

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).

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