C++和C文件I/O.

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

int main() {
    std::ofstream outfile("example.txt");
    if (!outfile) {
        std::cerr << "无法打开文件"<< std::endl;
        return 1;
    }

    outfile << "这是一个示例文件"<< std::endl;
    outfile.close();

    std::ifstream infile("example.txt");
    if (!infile) {
        std::cerr << "无法打开文件"<< std::endl;
        return 1;
    }

    std::string line;
    while (std::getline(infile, line)) {
        std::cout<< line<< std::endl;
    }

    infile.close();
    return 0;
}