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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-11 11:05:56 +09:00

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id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
c-math C Math Functions Programming_Language draft conceptual
math.h
sqrt ceil floor pow
C 수학 함수
B 0.83 2026-07-04 2026-07-04
c
programming-language
w3schools
math
math.h
https://www.w3schools.com/c/c_math.php

C Math Functions

🎯 한 줄 통찰 (One-line insight)

ceil() and floor() both return a float/double, NOT an int — printing ceil(1.4) with %f still shows a decimal-formatted result (2.000000), meaning "rounding" in C's math library doesn't convert the value to an integer type; it just replaces the fractional part while preserving the floating-point representation, so further formatting or casting is still the caller's job. [S1]

🧠 핵심 개념 (Core concepts)

  • <math.h> — required header for math functions beyond basic arithmetic operators. [S1]
  • sqrt(x) — returns the square root of x. [S1]
  • ceil(x) — rounds UP to the nearest integer value (still returned as a float/double). [S1]
  • floor(x) — rounds DOWN to the nearest integer value (still returned as a float/double). [S1]
  • pow(x, y) — returns x raised to the power of y (xʸ). [S1]

📖 세부 내용 (Details)

  • Square root: printf("%f", sqrt(16));. [S1]
  • Rounding up vs down on the same value: printf("%f", ceil(1.4)); printf("%f", floor(1.4)); — ceil gives 2.000000, floor gives 1.000000. [S1]
  • Exponentiation: printf("%f", pow(4, 3)); — 4³ = 64. [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/ceil/floor/pow는 게임 로직이나 그래픽 계산 등에서 흔히 결합해 쓰이는 기본 수학 함수 집합이다. [S1]

💻 코드 패턴 (Code patterns)

Rounding up and down, both still returned as floating-point values (C):

#include <math.h>
printf("%f", ceil(1.4));  // 2.000000
printf("%f", floor(1.4)); // 1.000000

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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "C Math Functions" page (Astra wiki-curation, P-Reinforce v3.1 format).