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title

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#):

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).

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