C++使用getline()读取输入文件和输出到输出文件时出现问题

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

int main() {
    std::ifstream inputFile("input.txt");
    if (!inputFile.is_open()) {
        std::cout << "Failed to open input file." << std::endl;
        return 1;
    }

    std::string line;
    while (std::getline(inputFile, line)) {
        // 处理每一行数据
        std::cout << line << std::endl;
    }

    inputFile.close();
    return 0;
}

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

int main() {
    std::ofstream outputFile("output.txt");
    if (!outputFile.is_open()) {
        std::cout << "Failed to open output file." << std::endl;
        return 1;
    }

    std::string line;
    while (std::getline(std::cin, line)) {
        outputFile << line << std::endl;
    }

    outputFile.close();
    return 0;
}