---
id: cpp-data-types-reallife
title: "C++ Data Types Examples"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["real-life data types", "total cost calculation", "C++ 데이터 타입 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", "data-types", "real-life-example"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_data_types_reallife.asp"]
applied_in: []
github_commit: ""
---

# [[CPP Data Types Examples]]

## 🎯 한 줄 통찰 (One-line insight)
This example prints the currency symbol by chaining a `char` directly onto a `double` in the SAME `cout` statement (`cout << total_cost << currency;`) with no separator or format specifier needed — a direct showcase of the earlier Variables chapter's insight that `<<` chaining eliminates C's type-matching requirement, applied here to mix a monetary amount and its currency symbol seamlessly. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Mixed-type arithmetic** — multiplying an `int` (`items`) by a `double` (`cost_per_item`) and storing the result in a `double` (`total_cost`). [S1]
- **Chaining different types in one cout statement** — combining a `double` and a `char` (currency symbol) directly via `<<`, no casting or format specifier needed. [S1]

## 📖 세부 내용 (Details)
- Full calculation and display: `int items = 50; double cost_per_item = 9.99; double total_cost = items * cost_per_item; char currency = '$'; cout << "Number of items: " << items << "\n"; cout << "Cost per item: " << cost_per_item << currency << "\n"; cout << "Total cost = " << total_cost << currency << "\n";`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- 현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

## 🛠️ 적용 사례 (Applied in summary)
수량(int)×단가(double)로 총 비용을 계산하고 통화 기호(char)를 같은 cout 문에 이어붙이는 이 예제 자체가 영수증/가격 계산 UI의 실전 활용 사례다. [S1]

## 💻 코드 패턴 (Code patterns)
Chaining a double and a char (currency symbol) in the same cout statement with no casting (C++):
```cpp
double total_cost = 50 * 9.99;
char currency = '$';
cout << "Total cost = " << total_cost << currency << "\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 Data Types String]], [[CPP Operators]]
- **참조 맥락:** 데이터 타입 섹션 마지막 — 연산자(Operators) 섹션으로 이어짐.

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

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