#include #include int main(){ std::cout << std::endl; std::string str; // std::string::size_type idx= str.find("no"); auto idx = str.find("no"); if (idx == std::string::npos) std::cout << "no not found " << std::endl; std::cout << std::endl; str = {"dkeu84kf8k48kdj39kdj74945du942"}; std::string str2{"84"}; std::cout << "str: " << str << std::endl; std::cout << "str2: " << str2 << std::endl; std::cout << "str.find('8'): " << str.find('8') << std::endl; std::cout << "str.rfind('8'): " << str.rfind('8') << std::endl; std::cout << "str.find('8', 10): " << str.find('8', 10) << std::endl; std::cout << "str.find(str2): " << str.find(str2) << std::endl; std::cout << "str.rfind(str2): " << str.rfind(str2) << std::endl; std::cout << "str.find(str2, 10): " << str.find(str2, 10) << std::endl; std::cout << std::endl; str2 = "0123456789"; std::cout << "str: " << str << std::endl; std::cout << "str2: " << str2 << std::endl; std::cout << "str.find_first_of(678): " << str.find_first_of("678") << std::endl; std::cout << "str.find_last_of(678): " << str.find_last_of("678") << std::endl; std::cout << "str.find_first_of(678, 10): " << str.find_first_of("678", 10) << std::endl; std::cout << "str.find_first_of(str2): " << str.find_first_of(str2) << std::endl; std::cout << "str.find_last_of(str2): " << str.find_last_of(str2) << std::endl; std::cout << "str.find_first_of(str2, 10): " << str.find_first_of(str2, 10) << std::endl; std::cout << std::endl; std::cout << "str: " << str << std::endl; std::cout << "str2: " << str2 << std::endl; std::cout << "str.find_first_not_of(678): " << str.find_first_not_of("678") << std::endl; std::cout << "str.find_last_not_of(678): " << str.find_last_not_of("678") << std::endl; std::cout << "str.find_first_not_of(678, 10): " << str.find_first_not_of("678", 10) << std::endl; std::cout << "str.find_first_not_of(str2): " << str.find_first_not_of(str2) << std::endl; std::cout << "str.find_last_not_of(str2): " << str.find_last_not_of(str2) << std::endl; std::cout << "str.find_first_not_of(str2, 10): " << str.find_first_not_of(str2, 10) << std::endl; std::cout << std::endl; }

- Solution

Solution #