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3.6 KiB
3.6 KiB
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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| c-variables-change | C Variable Values | Programming_Language | draft | conceptual |
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B | 0.84 | 2026-07-04 | 2026-07-04 |
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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 ofx, computesx + 1, and stores the result back intox; 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):
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).