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10_Wiki/Dev/Topic_CSharp/CSharp_For_Loop.md

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+---
+id: csharp-for-loop
+title: "C# For Loop"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["nested loops C#", "C# for 반복문"]
+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: ["csharp", "programming-language", "w3schools", "loops", "for"]
+raw_sources: ["https://www.w3schools.com/cs/cs_for_loop.php"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CSharp For Loop]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The three-statement `for (statement1; statement2; statement3)` structure and its nested-loop composition (outer loop's body containing a complete inner loop, with the inner loop restarting fully on every single outer iteration) are unchanged from C/C++ — the nested-loop iteration-count math shown here (`2 outer × 3 inner = 6 inner executions total`) is the same multiplicative relationship this wiki has already confirmed for C and C++ nested loops. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`for (statement1; statement2; statement3) { ... }`** — statement1 runs ONCE before the loop starts (initialization); statement2 is the condition checked before EVERY iteration; statement3 runs AFTER each iteration (typically increment/decrement). [S1]
+- **Step size is arbitrary** — statement3 doesn't have to be `i++`; it can be any expression, e.g. `i = i + 2` to iterate only even numbers. [S1]
+- **Nested loops** — a complete `for` loop placed inside another `for` loop's body; the inner loop runs to completion once for EVERY iteration of the outer loop. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic count: `for (int i = 0; i < 5; i++) { Console.WriteLine(i); }` → prints 0 through 4. [S1]
+- Step-by-2: `for (int i = 0; i <= 10; i = i + 2) { Console.WriteLine(i); }` → prints even numbers 0 through 10. [S1]
+- Nested loop with execution counts explicitly annotated: 
+  ```
+  for (int i = 1; i <= 2; ++i) {
+      Console.WriteLine("Outer: " + i);      // executes 2 times
+      for (int j = 1; j <= 3; j++) {
+          Console.WriteLine(" Inner: " + j); // executes 6 times total (2 * 3)
+      }
+  }
+  ```
+  [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **for문 구조와 중첩 반복 곱셈 관계가 C/C++와 동일**: 3-statement for 구조, 그리고 중첩 루프에서 "외부 루프 횟수 × 내부 루프 횟수"라는 곱셈 관계가 C/C++에서 확인된 것과 차이가 없다는 점이 이번 챕터에서 재확인됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+0-4 카운트, 짝수만 출력하는 step-2 루프, 2×3 중첩 루프의 실행 횟수를 주석으로 명시한 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Nested for loops — inner runs fully for each outer iteration (C#):
+```csharp
+for (int i = 1; i <= 2; ++i)
+{
+    Console.WriteLine("Outer: " + i);       // 2 times
+    for (int j = 1; j <= 3; j++)
+    {
+        Console.WriteLine(" Inner: " + j);  // 6 times total (2 * 3)
+    }
+}
+```
+
+## ✅ 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:** [[CSharp While Loop]], [[CSharp Foreach Loop]], [[CPP For Loop Nested]]
+- **참조 맥락:** Loops 섹션 — Foreach Loop 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C# For Loop — https://www.w3schools.com/cs/cs_for_loop.php
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C# For Loop" page (Astra wiki-curation, P-Reinforce v3.1 format).