---
id: c-operators-comparison
title: "C Comparison Operators"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["== != > <", "boolean 1 or 0", "C 비교 연산자"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.85
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["c", "programming-language", "w3schools", "operators", "comparison"]
raw_sources: ["https://www.w3schools.com/c/c_operators_comparison.php"]
applied_in: []
github_commit: ""
---

# [[C Comparison Operators]]

## 🎯 한 줄 통찰 (One-line insight)
Unlike languages with a dedicated `bool`/`Boolean` type, C's comparison operators return plain INTEGERS — `1` for true, `0` for false — meaning the result of `x > y` can be printed with `%d` just like any other int, stored in an `int` variable, and used in arithmetic, because C has no separate boolean type at this point in the tutorial; true/false IS just 1/0. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Six comparison operators** — `==` (equal), `!=` (not equal), `>` (greater than), `<` (less than), `>=` (greater or equal), `<=` (less or equal). [S1]
- **Integer return value** — every comparison returns `1` (true) or `0` (false), printable with `%d`. [S1]
- **Practical decision-making use** — comparisons are the mechanism for finding answers and making decisions in a program, foreshadowing the upcoming if/else chapters. [S1]

## 📖 세부 내용 (Details)
- Basic greater-than check: `int x = 5; int y = 3; printf("%d", x > y); // returns 1 (true)`. [S1]
- Voting age eligibility check: `int age = 18; printf("%d\n", age >= 18); // 1 (true) printf("%d\n", age < 18); // 0 (false)`. [S1]
- Password length check: `int passwordLength = 5; printf("%d\n", passwordLength >= 8); // 0 (false), too short`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **비교 결과는 진짜 정수형**: 별도의 불리언 타입 없이 비교 연산 결과가 그냥 1 또는 0인 정수로 반환된다는 점이 명시되며, 이는 이후 Booleans 챕터에서 더 자세히 다뤄질 예정임이 언급됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
투표 가능 연령 확인(age >= 18)과 비밀번호 길이 확인(passwordLength >= 8)이 원문에서 직접 실전 활용 사례로 제시됨. [S1]

## 💻 코드 패턴 (Code patterns)
Comparison operators returning plain integers (1 or 0), used for real-world eligibility checks (C):
```c
int age = 18;
printf("%d\n", age >= 18); // 1 (true), old enough to vote
printf("%d\n", age < 18);  // 0 (false)
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.85
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[C Tutorial]]
- **관련 개념:** [[C Operators Assignment]], [[C Operators Logical]], [[C Booleans]]
- **참조 맥락:** 비교 연산자 — 논리 연산자(Operators Logical) 챕터로 이어짐, 불리언(Booleans) 챕터와 직접 연결.

## 📚 출처 (Sources)
- [S1] W3Schools — C Comparison Operators — https://www.w3schools.com/c/c_operators_comparison.php

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