有用户类型的文件，他们想要读取和附加文件名C++

#include <iostream>
#include <fstream>
#include <string>

int main() {
    std::string filename = "example.txt";
    
    // 读取文件
    std::ifstream inputFile(filename);
    if (inputFile.is_open()) {
        std::string line;
        while (std::getline(inputFile, line)) {
            std::cout << line << std::endl;
        }
        inputFile.close();
    } else {
        std::cout << "无法打开文件：" << filename << std::endl;
    }
    
    // 附加文件名
    std::ofstream outputFile(filename, std::ios::app);
    if (outputFile.is_open()) {
        std::string newFilename = "appended.txt";
        outputFile << newFilename << std::endl;
        outputFile.close();
    } else {
        std::cout << "无法打开文件：" << filename << std::endl;
    }
    
    return 0;
}