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10_Wiki/Dev/Topic_CPP/CPP_Pointers_Modify.md

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+---
+id: cpp-pointers-modify
+title: "C++ Modify Pointers"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["mutating through a pointer", "C++ 포인터 값 수정"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.83
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["cpp", "programming-language", "w3schools", "pointers"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_pointers_modify.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP Modify Pointers]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Assigning `*ptr = "Hamburger";` doesn't change what the POINTER points to — it changes the VALUE at the address the pointer already points to — so the original variable (`food`) changes too, since `ptr` and `food` still reference the exact same memory location; this is the mechanical proof behind why passing a pointer into a function lets that function permanently alter the caller's data. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`*ptr = newValue;`** — writes a new value AT the memory address the pointer references, which is the SAME memory the original variable occupies. [S1]
+- **Original variable changes too** — because `ptr` and the original variable share one memory location, mutating through the pointer is indistinguishable from mutating the variable directly. [S1]
+
+## 📖 세부 내용 (Details)
+- Full mutation-through-pointer sequence: `string food = "Pizza"; string* ptr = &food; cout << *ptr; // Pizza *ptr = "Hamburger"; cout << *ptr; // Hamburger cout << food; // Hamburger — the original changed too`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 포인터를 통해 원본 변수의 값을 변경하는 이 메커니즘이 함수에 포인터를 전달해 원본 데이터를 수정하는 실전 패턴(Function Pointer/Reference 챕터)의 근거가 된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Mutating a value through a pointer changes the original variable (C++):
+```cpp
+string food = "Pizza";
+string* ptr = &food;
+*ptr = "Hamburger";  // Change the value at the pointed-to address
+cout << food; // Outputs "Hamburger" — the original variable changed
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.83
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C++ Tutorial]]
+- **관련 개념:** [[CPP Pointers Dereference]], [[CPP Memory Management]], [[C Pointers]]
+- **참조 맥락:** 포인터 값 수정 — 메모리 관리(Memory Management) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ Modify Pointers — https://www.w3schools.com/cpp/cpp_pointers_modify.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Modify Pointers" page (Astra wiki-curation, P-Reinforce v3.1 format).