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10_Wiki/Dev/Topic_CPP/CPP_Strings_Input.md

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+---
+id: cpp-strings-input
+title: "C++ User Input Strings"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["cin extraction operator", "getline function", "C++ 사용자 입력 문자열"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.86
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["cpp", "programming-language", "w3schools", "strings", "cin", "getline"]
+raw_sources: ["https://www.w3schools.com/cpp/cpp_strings_input.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[CPP User Input Strings]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`cin >>` has the EXACT SAME whitespace-termination limitation as C's `scanf("%s", ...)` — typing "John Doe" only captures "John" — and C++'s fix (`getline(cin, fullName)`) mirrors C's `fgets()` fix conceptually, both existing specifically to read a full line including spaces, meaning this particular parsing limitation and its solution transferred from C to C++ despite the completely different I/O syntax (`>>`/`cin` versus `scanf`/format-strings). [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`cin >> variable`** — the extraction operator, reads user input into a variable. [S1]
+- **`cin`'s whitespace-termination limitation** — treats spaces as a terminator, so it can only capture a SINGLE WORD even if the user types multiple words. [S1]
+- **`getline(cin, variable)`** — reads a FULL LINE of text including spaces; takes `cin` as the first parameter and the target string as the second. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic single-word input: `string firstName; cin >> firstName;`. [S1]
+- The space-termination trap demonstrated: `string fullName; cin >> fullName; // "John Doe" typed → only "John" stored`. [S1]
+- The `getline()` fix for multi-word input: `string fullName; getline (cin, fullName); // "John Doe" typed → "John Doe" stored in full`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **cin >>은 공백에서 끊김**: "John Doe"를 입력해도 공백을 종료 문자로 취급해 "John"만 저장된다는 점이 C의 scanf("%s") 문제와 동일하게 확인되며, getline()이 fgets()와 동일한 역할의 해결책으로 제시됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+사용자의 전체 이름(공백 포함)을 정확히 입력받기 위해 cin >> 대신 getline()을 사용하는 예제가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Reading a full line of text (including spaces) with getline() instead of cin >> (C++):
+```cpp
+string fullName;
+cout << "Type your full name: ";
+getline(cin, fullName);
+cout << "Your name is: " << fullName; // "John Doe" prints in full
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[C++ Tutorial]]
+- **관련 개념:** [[CPP Strings Esc]], [[CPP Strings Length]], [[C User Input]]
+- **참조 맥락:** 사용자 입력 문자열 — 문자열 길이(Strings Length) 챕터로 이어짐.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — C++ User Input Strings — https://www.w3schools.com/cpp/cpp_strings_input.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "C++ User Input Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).