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10_Wiki/Topic_Programming/Topic_C/C_Variables_RealLife.md

@@ -0,0 +1,68 @@
+---
+id: c-variables-reallife
+title: "C Variables - Examples"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["real-life variables", "rectangle area example", "C 변수 실전 예제"]
+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: ["c", "programming-language", "w3schools", "variables", "real-life-example"]
+raw_sources: ["https://www.w3schools.com/c/c_variables_reallife.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[C Variables - Examples]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The source explicitly admits its own teaching convention (naming variables `myInt`/`myNum`/`myChar` after their TYPE) is an artificial simplification "to avoid confusion" — and this real-life chapter exists specifically to break that habit, showing that real variables should be named after what they REPRESENT (`studentID`, `studentGrade`) not what type they are, reinforcing the earlier Variable Names chapter's descriptive-naming advice with a concrete before/after contrast. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Type-based teaching names vs. domain names** — tutorial examples use `myNum`/`myChar` for clarity during learning, but real programs should name variables after their real-world meaning. [S1]
+- **Multiple variables of different types working together** — one program can combine `int`, `float`, and `char` variables all representing facets of the same real-world entity (a student record). [S1]
+- **Calculate-then-print pattern** — perform a calculation first, store the result in a variable, and only then print it — rather than computing inline inside the print call. [S1]
+
+## 📖 세부 내용 (Details)
+- Student record combining three types: `int studentID = 15; int studentAge = 23; float studentFee = 75.25; char studentGrade = 'B';` printed with matching `%d`/`%f`/`%c` specifiers. [S1]
+- Rectangle area calculate-then-print: `int length = 4; int width = 6; int area; area = length * width; printf("Area of the rectangle is: %d", area);`. [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 — 학생 정보(ID/나이/수수료/학점)를 하나의 프로그램에서 함께 다루는 예제가 서로 다른 타입의 변수를 실제 데이터 모델링에 사용하는 대표 사례다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Calculating a value first, then printing the stored result (C):
+```c
+int length = 4;
+int width = 6;
+int area;
+area = length * width;
+printf("Area of the rectangle is: %d", area);
+```
+
+## ✅ 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:** [[C Variables Format]], [[C Variables Names]], [[C Data Types]]
+- **참조 맥락:** 변수 섹션 마지막 — 데이터 타입(Data Types) 섹션으로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C Variables - Examples — https://www.w3schools.com/c/c_variables_reallife.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C Variables - Examples" page (Astra wiki-curation, P-Reinforce v3.1 format).