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74 lines
4.0 KiB
Markdown
74 lines
4.0 KiB
Markdown
---
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id: c-strings
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title: "C Strings"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["char array", "null terminator", "C 문자열"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["c", "programming-language", "w3schools", "strings"]
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raw_sources: ["https://www.w3schools.com/c/c_strings.php"]
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applied_in: []
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github_commit: ""
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---
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# [[C Strings]]
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## 🎯 한 줄 통찰 (One-line insight)
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C has no true `String` type at all — a string is just an array of `char`s ending in a special `\0` null-terminator character, proven directly by the fact that `sizeof()` reports the SAME size (13 bytes) whether the string was written as a convenient literal (`"Hello World!"`) or manually spelled out character-by-character with an explicit `\0` at the end (`{'H','e',...,'!','\0'}`) — the literal syntax is pure convenience, not a different underlying type. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **No dedicated String type** — a C "string" is a `char` array; `char greetings[] = "Hello World!";` is the idiomatic way to create one. [S1]
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- **`%s` format specifier** — used to print an entire string (as opposed to `%c` for a single character). [S1]
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- **Index access** — since a string is an array, `greetings[0]` accesses its first character, printed with `%c`. [S1]
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- **Mutable characters** — individual characters can be reassigned via index (`greetings[0] = 'J';`), changing the string in place. [S1]
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- **Null terminator (`\0`)** — required at the end of a manually-built character-list string; string literals get it added automatically. [S1]
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- **Loop-through pattern** — iterating a string's characters via a `for` loop, ideally using `sizeof(arr)/sizeof(arr[0])` for the length instead of a hardcoded number. [S1]
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## 📖 세부 내용 (Details)
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- Modifying a single character: `char greetings[] = "Hello World!"; greetings[0] = 'J'; printf("%s", greetings); // Outputs Jello World!`. [S1]
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- Manual character-list construction requiring an explicit null terminator: `char greetings[] = {'H','e','l','l','o',' ','W','o','r','l','d','!','\0'};`. [S1]
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- Proving both construction methods produce identically-sized arrays: `printf("%zu\n", sizeof(greetings)); // 13` and `printf("%zu\n", sizeof(greetings2)); // 13` (literal form auto-adds `\0`). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **문자열 리터럴과 수동 문자 나열의 동등성**: 두 방식 모두 결국 동일한 크기(13바이트, \0 포함)의 char 배열을 만든다는 점이 sizeof 비교로 직접 증명됨 — 리터럴은 단지 \0을 자동으로 추가해주는 편의 문법일 뿐. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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인사말과 이름을 조합해 환영 메시지를 만드는 예제(`"%s %s!", message, fname`)가 원문에서 직접 실전 활용 사례로 제시됨. [S1]
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## 💻 코드 패턴 (Code patterns)
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Looping through a string's characters using sizeof for a portable length calculation (C):
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```c
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char carName[] = "Volvo";
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int length = sizeof(carName) / sizeof(carName[0]);
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int i;
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for (i = 0; i < length; ++i) {
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printf("%c\n", carName[i]);
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}
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[C Tutorial]]
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- **관련 개념:** [[C Operators Precedence]], [[C Arrays]], [[C Strings Esc]]
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- **참조 맥락:** 문자열 섹션 첫 챕터 — 특수문자/이스케이프(Strings Esc) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — C Strings — https://www.w3schools.com/c/c_strings.php
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "C Strings" page (Astra wiki-curation, P-Reinforce v3.1 format).
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