size_type find(const basic_string& str, size_type pos = 0) const noexcept;
std::string my_str = "Hello, world!"; std::string search_str = "world"; std::size_t found_pos = my_str.find(search_str); if (found_pos != std::string::npos) { std::cout << "Found at position " << found_pos << std::endl; } else { std::cout << "Not found" << std::endl; }
std::string my_str = "Hello, world!"; char search_char = 'o'; std::size_t found_pos = my_str.find(search_char); if (found_pos != std::string::npos) { std::cout << "Found at position " << found_pos << std::endl; } else { std::cout << "Not found" << std::endl; }This example searches for the character 'o' within the string "Hello, world!". If the character is found, the position is printed (in this case, 4). The `std::basic_string::find` method is part of the standard C++ library, which is included as part of the C++ Standard Template Library (STL). Therefore, no additional package or library needs to be installed to use it.