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10_Wiki/Topic_Programming/Topic_C/C_Variables_Change.md

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+---
+id: c-variables-change
+title: "C Variable Values"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["reassignment", "self-referential assignment", "C 변수 값 변경"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.84
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["c", "programming-language", "w3schools", "variables", "assignment"]
+raw_sources: ["https://www.w3schools.com/c/c_variables_change.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[C Variable Values]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`x = x + 1` is explicitly explained not as a mathematical equation (which would be false — x can never equal x+1) but as an INSTRUCTION: "take the current value of x and add 1 to it, [then store the result back into x]" — a reframing crucial for anyone whose intuition for `=` comes from algebra rather than programming's assignment semantics. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Reassignment overwrites** — assigning a new value to an existing variable replaces the old value entirely; this is normal/expected behavior, not an error. [S1]
+- **Variable-to-variable copying** — `myNum = myOtherNum;` copies the CURRENT value of one variable into another; the two remain independent afterward (no live link). [S1]
+- **Copying into a previously-unassigned variable** — a variable declared without an initial value can still receive a value via copy-assignment later. [S1]
+- **Self-referential assignment (`x = x + 1`)** — reads the current value of `x`, computes `x + 1`, and stores the result back into `x`; this is an instruction/mutation, not an algebraic equality. [S1]
+
+## 📖 세부 내용 (Details)
+- Simple reassignment: `int myNum = 15; myNum = 10; // Now myNum is 10`. [S1]
+- Variable-to-variable copy: `int myNum = 15; int myOtherNum = 23; myNum = myOtherNum; // myNum is now 23`. [S1]
+- Adding two variables into a third: `int x = 5; int y = 6; int sum = x + y;`. [S1]
+- Self-referential update: `int x = 5; x = x + 1; // x is now 6`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **= 기호는 수학적 등식이 아님**: x = x + 1이 대수적으로는 성립할 수 없는 식이지만, 프로그래밍에서는 "현재 x값에 1을 더해 다시 x에 저장하라"는 명령으로 해석되어야 한다는 점이 명시적으로 설명됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — x = x + 1 패턴이 이후 반복문(Loops) 챕터에서 카운터 증가 로직의 기초가 된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Self-referential assignment — reading and updating the same variable (C):
+```c
+int x = 5;
+x = x + 1;  // x is now 6
+printf("%d", x);
+```
+
+## ✅ 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:** [[C Variables Names]], [[C Variables Multiple]], [[C While Loop]]
+- **참조 맥락:** 변수 값 변경과 재대입 — 여러 변수 한번에 선언하기(Variables Multiple) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C Variable Values — https://www.w3schools.com/c/c_variables_change.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C Variable Values" page (Astra wiki-curation, P-Reinforce v3.1 format).