---
id: cpp-while-loop-reallife
title: "C++ While Loop Examples"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["number reversal", "Yatzy example", "C++ while 루프 실전 예제"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.82
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["cpp", "programming-language", "w3schools", "loops", "while", "real-life-example"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_while_loop_reallife.asp"]
applied_in: []
github_commit: ""
---

# [[CPP While Loop Examples]]

## 🎯 한 줄 통찰 (One-line insight)
`while (numbers)` still works as a bare-integer condition in C++ exactly as it did in C — relying on the same implicit non-zero-is-true rule — confirming that C++'s inherited arithmetic/truthiness semantics extend even to this somewhat unusual loop-condition style, not just to explicit boolean comparisons. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Bare-integer condition** — `while (numbers)` treats any non-zero `numbers` as true; the loop stops when it becomes 0. [S1]
- **Digit extraction via `% 10` and `/ 10`** — same technique as C for reversing a number's digits. [S1]
- **While loop combined with if/else** — the Yatzy example nests conditional logic inside the loop body. [S1]

## 📖 세부 내용 (Details)
- Number reversal using a bare-integer condition: `int numbers = 12345; int revNumbers = 0; while (numbers) { revNumbers = revNumbers * 10 + numbers % 10; numbers /= 10; } cout << "Reversed numbers: " << revNumbers << "\n";`. [S1]
- Yatzy dice-checking loop: `int dice = 1; while (dice <= 6) { if (dice < 6) { cout << "No Yatzy\n"; } else { cout << "Yatzy!\n"; } dice = dice + 1; }`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources). C 챕터와 동일한 예제 및 정수 조건 특성이 확인됨.

## 🛠️ 적용 사례 (Applied in summary)
12345를 54321로 뒤집는 숫자 반전 알고리즘이 원문에서 직접 실전 활용 사례로 제시됨. [S1]

## 💻 코드 패턴 (Code patterns)
Reversing a number's digits using a bare-integer while condition (C++):
```cpp
int numbers = 12345;
int revNumbers = 0;
while (numbers) {
  revNumbers = revNumbers * 10 + numbers % 10;
  numbers /= 10;
}
cout << "Reversed numbers: " << revNumbers << "\n";
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.82
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C++ Tutorial]]
- **관련 개념:** [[CPP While Loop]], [[CPP Do While Loop]], [[C While Loop RealLife]]
- **참조 맥락:** while 루프 실전 예제 — do/while 루프(Do While Loop) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — C++ While Loop Examples — https://www.w3schools.com/cpp/cpp_while_loop_reallife.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C++ While Loop Examples" page (Astra wiki-curation, P-Reinforce v3.1 format).
