2nd/10_Wiki/Dev/Topic_CPP/CPP_User_Input.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
cpp-user-input	C++ User Input	Programming_Language	draft	conceptual		cin extraction operator C++ 사용자 입력		B	0.84	2026-07-04	2026-07-04			cpp programming-language w3schools user-input cin	https://www.w3schools.com/cpp/cpp_user_input.asp

CPP User Input

🎯 한 줄 통찰 (One-line insight)

cin and cout form a deliberately symmetric pair — the source explicitly pairs their pronunciations ("see-out"/"see-in") and their operators (<< insertion / >> extraction) as mirror images of each other, meaning learning cout << from the Output chapter directly transfers to cin >> here: same object-and-operator pattern, just reversed in data direction and operator angle. [S1]

🧠 핵심 개념 (Core concepts)

• cin — a predefined variable that reads keyboard input, using the EXTRACTION operator >> (mirror of cout's insertion operator <<). [S1]
• Both belong to <iostream> — cin and cout are both part of the same standard input/output streams library. [S1]
• Building a simple calculator — chaining two cin >> reads plus arithmetic demonstrates a complete interactive program. [S1]

📖 세부 내용 (Details)

• Basic numeric input: int x; cout << "Type a number: "; cin >> x; cout << "Your number is: " << x;. [S1]
• A two-number calculator: int x, y, sum; cin >> x; cin >> y; sum = x + y; cout << "Sum is: " << sum;. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

• 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

두 숫자를 입력받아 합을 계산하는 간단한 계산기 프로그램이 원문에서 직접 실전 활용 사례로 제시됨. [S1]

💻 코드 패턴 (Code patterns)

A simple calculator built from two cin reads and an arithmetic sum (C++):

int x, y, sum;
cout << "Type a number: ";
cin >> x;
cout << "Type another number: ";
cin >> y;
sum = x + y;
cout << "Sum is: " << sum;

✅ 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: CPP Scope, CPP Date, CPP Strings Input
• 참조 맥락: 사용자 입력 — 날짜와 시간(Date) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — C++ User Input — https://www.w3schools.com/cpp/cpp_user_input.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "C++ User Input" page (Astra wiki-curation, P-Reinforce v3.1 format).