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title

C If ... Else Examples

🎯 한 줄 통찰 (One-line insight)

The even/odd checker reuses the % modulus operator from the Arithmetic Operators chapter for a purpose that has nothing to do with "remainder after division" in the everyday sense — myNum % 2 == 0 is the standard idiom for parity checking, showing that modulus's real-world utility often lies in binary classification (even/odd, every-Nth) rather than literal division-remainder arithmetic. [S1]

🧠 핵심 개념 (Core concepts)

This chapter is a compilation — six worked real-life if/else scenarios, consolidating patterns from every prior Conditions sub-chapter (basic if/else, else-if chains, nested if, logical operators). [S1]
Door-code check — a single == equality check gating access. [S1]
Positive/negative/zero classification — a three-way if/else if/else chain covering all three number sign cases. [S1]
Even/odd via modulus — num % 2 == 0 is the standard parity-check idiom. [S1]
Temperature banding — a three-tier if/else if/else chain (freezing/cool/warm) based on numeric thresholds. [S1]

📖 세부 내용 (Details)

Door code check: int doorCode = 1337; if (doorCode == 1337) { printf("Correct code.\nThe door is now open."); } else { printf("Wrong code.\nThe door remains closed."); }. [S1]
Positive/negative/zero: int myNum = 10; if (myNum > 0) { printf("The value is a positive number."); } else if (myNum < 0) { printf("The value is a negative number."); } else { printf("The value is 0."); }. [S1]
Even/odd check: int myNum = 5; if (myNum % 2 == 0) { printf("%d is even.\n", myNum); } else { printf("%d is odd.\n", myNum); }. [S1]
Temperature banding: int temperature = 30; if (temperature < 0) { printf("It's freezing!\n"); } else if (temperature < 20) { printf("It's cool.\n"); } else { printf("It's warm.\n"); }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

현재까지 발견된 모순 사항 없음 (No contradictions found in available sources).

🛠️ 적용 사례 (Applied in summary)

도어락 코드 확인, 숫자 부호 판별, 짝/홀수 판별, 온도 구간 분류, 접근 제어 등 6가지 실전 시나리오가 원문에서 직접 제시되며, 각각이 조건문 섹션 전체를 종합한 실전 활용 사례다. [S1]

💻 코드 패턴 (Code patterns)

The standard parity-check idiom using the modulus operator (C):

int myNum = 5;
if (myNum % 2 == 0) {
  printf("%d is even.\n", myNum);
} else {
  printf("%d is odd.\n", myNum);
}

✅ 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: C Conditions Nested, C Operators Arithmetic, C Switch
참조 맥락: 조건문 섹션 마지막 — switch 문(Switch) 섹션으로 이어짐.

📚 출처 (Sources)

[S1] W3Schools — C If ... Else Examples — https://www.w3schools.com/c/c_conditions_reallife.php

📝 변경 이력 (Change history)

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

3.9 KiB Raw Blame History