---
id: cpp-math
title: "C++ Math"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["max min functions", "cmath library", "C++ 수학 함수"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.83
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["cpp", "programming-language", "w3schools", "math", "cmath"]
raw_sources: ["https://www.w3schools.com/cpp/cpp_math.asp"]
applied_in: []
github_commit: ""
---

# [[CPP Math]]

## 🎯 한 줄 통찰 (One-line insight)
`max()` and `min()` are used with NO header include shown in the source's own examples, while `sqrt()`, `round()`, and `log()` explicitly require `#include <cmath>` — a distinction the source draws implicitly through its section structure (max/min presented first, standalone; `<cmath>` functions grouped separately under their own header requirement), suggesting C++ split basic comparison-style math from the broader mathematical function library across different availability boundaries. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`max(x, y)`** — returns the higher of two values. [S1]
- **`min(x, y)`** — returns the lower of two values. [S1]
- **`<cmath>` header** — required for broader math functions: `sqrt()` (square root), `round()` (rounds a number), `log()` (natural logarithm), and more. [S1]

## 📖 세부 내용 (Details)
- Basic max/min: `cout << max(5, 10); cout << min(5, 10);`. [S1]
- cmath-based functions: `#include <cmath> cout << sqrt(64); cout << round(2.6); cout << log(2);`. [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 — sqrt/round/log 등 cmath 함수들이 이후 챕터의 다양한 계산 로직에서 재사용될 수 있는 기본 도구다. [S1]

## 💻 코드 패턴 (Code patterns)
Using cmath library functions for square root, rounding, and logarithm (C++):
```cpp
#include <cmath>
cout << sqrt(64);   // 8
cout << round(2.6); // 3
cout << log(2);     // 0.693147...
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.83
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C++ Tutorial]]
- **관련 개념:** [[CPP Strings Numbers]], [[CPP Booleans]], [[C Math]]
- **참조 맥락:** 수학 섹션 유일 챕터 — 불리언(Booleans) 섹션으로 이어짐.

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

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