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---
id: cpp-output-numbers
title: "C++ Output Numbers"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["cout math expressions", "C++ 숫자 출력"]
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", "output", "numbers"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_output_numbers.asp"]
applied_in: []
github_commit: ""
---
# [[CPP Output Numbers]]
## 🎯 한 줄 통찰 (One-line insight)
`cout <<` accepts a raw MATHEMATICAL EXPRESSION directly (`cout << 3 + 3;`), not just a pre-computed variable or literal — meaning `<<`'s right-hand side is evaluated as a genuine expression before printing, unlike a naive assumption that only simple values can follow the insertion operator. [S1]
## 🧠 핵심 개념 (Core concepts)
- **No quotes for numbers** — unlike text, numeric values are NOT wrapped in double quotes when printed with `cout`. [S1]
- **Inline expression evaluation** — `cout << 3 + 3;` computes the sum THEN prints the result (6), not the literal text "3 + 3". [S1]
## 📖 세부 내용 (Details)
- Printing a bare number: `cout << 3;`. [S1]
- Printing the result of addition: `cout << 3 + 3; // 6`. [S1]
- Printing the result of multiplication: `cout << 2 * 5; // 10`. [S1]
## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).
## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — cout에 수식을 직접 넣어 계산 결과를 출력하는 패턴이 이후 산술 연산자(Operators Arithmetic) 챕터의 기초가 된다. [S1]
## 💻 코드 패턴 (Code patterns)
Printing the result of an inline arithmetic expression (C++):
```cpp
cout << 3 + 3; // Outputs 6, not "3 + 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:** 0.82
- **중복 검사 결과:** 신규 생성 (New discovery)
## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C++ Tutorial]]
- **관련 개념:** [[CPP Output]], [[CPP New Lines]]
- **참조 맥락:** 숫자 출력 — 줄바꿈(New Lines) 챕터로 이어짐.
## 📚 출처 (Sources)
- [S1] W3Schools — C++ Output Numbers — https://www.w3schools.com/cpp/cpp_output_numbers.asp
## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "C++ Output Numbers" page (Astra wiki-curation, P-Reinforce v3.1 format).