---
id: cpp-conditions-else
title: "C++ Else"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["else statement", "C++ else 문"]
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", "conditions", "else"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_conditions_else.asp"]
applied_in: []
github_commit: ""
---

# [[CPP Else]]

## 🎯 한 줄 통찰 (One-line insight)
The identical time-of-day (`time < 18`) example and the identical `isDay`-naming advice from C's Else chapter reappear here unchanged — confirming that descriptive boolean naming as a pure communication device (not a behavioral change) is a language-agnostic best practice the tutorial deliberately repeats across both C and C++. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`else`** — runs a block of code when the paired `if` condition is false. [S1]
- **Mutually exclusive branches** — exactly one of `if`/`else` executes. [S1]
- **Descriptive boolean naming** — storing a condition in a variable like `isDay` documents its MEANING. [S1]

## 📖 세부 내용 (Details)
- Basic if/else: `int time = 20; if (time < 18) { cout << "Good day."; } else { cout << "Good evening."; } // Outputs "Good evening."`. [S1]
- Same logic with a descriptively-named boolean: `bool isDay = time < 18; if (isDay) { cout << "Good day."; } else { cout << "Good evening."; }`. [S1]

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

## 🛠️ 적용 사례 (Applied in summary)
시간(time)이 18보다 작은지에 따라 "좋은 하루"/"좋은 저녁"을 출력하는 예제가 C 챕터와 동일하게 실전 활용 사례로 제시됨. [S1]

## 💻 코드 패턴 (Code patterns)
Naming a boolean condition descriptively for readability (C++):
```cpp
int time = 20;
bool isDay = time < 18;
if (isDay) {
  cout << "Good day.";
} else {
  cout << "Good evening.";
}
```

## ✅ 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 Conditions]], [[CPP Conditions ElseIf]], [[C Conditions Else]]
- **참조 맥락:** else 문 — else if 문(Conditions ElseIf) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — C++ Else — https://www.w3schools.com/cpp/cpp_conditions_else.asp

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