ofsstreamのサンプルコード

ofstream_sample.cpp

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



int main()
{
    std::string data = "hoge, piyo, fuga";
    std::ofstream ofs;
    ofs.open("./test.txt", std::ios::out | std::ios::trunc);
    if(!ofs.is_open()) {
        std::cout << "file open failed." << std::endl;
        return -1;
    }

    for(int i = 0; i < 1000; i++) {
        ofs << "No." << i << " " << data << std::endl;
        if(ofs.fail()) {
            std::cout << "write error." << std::endl;
            ofs.close();
            return -1;
        }
    }

    ofs.close();
    std::cout << "test.txt created." << std::endl;
    return 0;
}