#include #include #include using namespace std; int main() { // ===== 1. 생성 & 초기화 ===== string s1 = "Hello"; string s2("World"); string s3(5, 'A'); // "AAAAA" string s4 = s1 + " " + s2; // "Hello World" cout << "[생성] " << s1 << " | " << s2 << " | " << s3 << " | " << s4 << "\n\n"; // ===== 2. 크기 & 접근 ===== string s = "hello"; cout << "[크기] size=" << s.size() << ", empty=" << boolalpha << s.empty() << "\n"; cout << "[접근] s[1]=" << s[1] << ", at(1)=" << s.at(1) << ", front=" << s.front() << ", back=" << s.back() << "\n\n"; // ===== 3. 수정 ===== s.push_back('!'); // hello! s.pop_back(); // hello s.insert(1, "123"); // h123ello s.erase(1, 3); // hello s.replace(0, 2, "yo"); // yollo cout << "[수정] " << s << "\n\n"; s.clear(); // "" cout << "[clear 후 empty] " << s.empty() << "\n\n"; // ===== 4. 부분 문자열 & 찾기 ===== string t = "abracadabra"; cout << "[substr] " << t.substr(0, 3) << "\n"; // "abr" cout << "[find] cad 위치: " << t.find("cad") << "\n"; // 4 cout << "[rfind] 마지막 a: " << t.rfind("a") << "\n"; // 10 cout << "[find_first_of] cd 중 첫 등장: " << t.find_first_of("cd") << "\n"; // 4 cout << "[find_last_of] 마지막 a 위치: " << t.find_last_of("a") << "\n\n"; // 10 // ===== 5. 비교 ===== string a = "apple", b = "banana"; cout << "[비교] (a==b)=" << (a==b) << ", (a

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