在C++中将输入写入文件和从文件读取

#include <fstream>

int main() {
    std::ofstream outputFile;
    outputFile.open("example.txt", std::ios::out);

    if (outputFile.is_open()) {
        outputFile << "Hello, World!" << std::endl;
        outputFile.close();
    } else {
        // 处理文件打开失败的情况
    }

    return 0;
}

#include <fstream>
#include <iostream>

int main() {
    std::ifstream inputFile;
    inputFile.open("example.txt", std::ios::in);

    if (inputFile.is_open()) {
        std::string input;
        inputFile >> input;
        std::cout << "Input from file: " << input << std::endl;
        inputFile.close();
    } else {
        // 处理文件打开失败的情况
    }

    return 0;
}