2nd/10_Wiki/Dev/Topic_C/C_While_Loop_RealLife.md

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-while-loop-reallife	C While Loop Examples	Programming_Language	draft	conceptual		number reversal Yatzy example C while 루프 실전 예제		B	0.84	2026-07-04	2026-07-04			c programming-language w3schools loops while real-life-example	https://www.w3schools.com/c/c_while_loop_reallife.php

C While Loop Examples

🎯 한 줄 통찰 (One-line insight)

The number-reversal example uses while (numbers) — a bare integer as the condition, not an explicit comparison — relying on C's implicit rule that any NON-ZERO value is truthy and 0 is falsy; the loop naturally terminates once repeated division (numbers /= 10) drives the value down to exactly 0, showing that C loop conditions don't need to be boolean-shaped expressions at all, just any value that eventually becomes 0. [S1]

🧠 핵심 개념 (Core concepts)

• Bare-integer condition — while (numbers) treats any non-zero numbers as true; the loop stops precisely when numbers becomes 0. [S1]
• Digit extraction via % 10 and / 10 — numbers % 10 isolates the last digit; numbers /= 10 removes it, a combination reused from the modulus/division operators. [S1]
• Number reversal by rebuilding — revNumbers = revNumbers * 10 + numbers % 10; shifts previously-extracted digits left and appends the newly extracted one, building the reversed number digit by digit. [S1]
• While loop combined with if/else — the Yatzy example nests conditional logic inside the loop body to react differently depending on the current iteration's value. [S1]

📖 세부 내용 (Details)

• Even-numbers-only printer: int i = 0; while (i <= 10) { printf("%d\n", i); i += 2; }. [S1]
• Number reversal using a bare-integer condition: int numbers = 12345; int revNumbers = 0; while (numbers) { revNumbers = revNumbers * 10 + numbers % 10; numbers /= 10; }. [S1]
• Yatzy dice-checking loop: int dice = 1; while (dice <= 6) { if (dice < 6) { printf("No Yatzy\n"); } else { printf("Yatzy!\n"); } dice = dice + 1; }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 정수 자체가 조건이 될 수 있음: while(numbers)처럼 비교 연산자 없이 정수 자체를 조건으로 사용할 수 있고, 0이 아니면 참, 0이면 거짓으로 취급된다는 점이 예제로 확인됨. [S1]

🛠️ 적용 사례 (Applied in summary)

12345를 54321로 뒤집는 숫자 반전 알고리즘이 원문에서 직접 실전 활용 사례로 제시되며, 나머지(%)와 몫(/) 연산을 조합해 자릿수를 하나씩 분해/재조립하는 기법을 보여준다. [S1]

💻 코드 패턴 (Code patterns)

Reversing a number's digits using a bare-integer while condition (C):

int numbers = 12345;
int revNumbers = 0;
while (numbers) {
  revNumbers = revNumbers * 10 + numbers % 10;
  numbers /= 10;
}

✅ 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 While Loop, C Do While Loop, C Operators Arithmetic
• 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/c/c_while_loop_reallife.php

📝 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).