fileIOBase

#include <iostream>
#include <fstream>

int main()
{
    std::ofstream outf;

    //std::ios::app - append to file
    //std::ios::ate - at the end - go to the end of file
    //std::ios::binary - open file in binary mode
    //std::ios::in - open file to read - input mode default for ifstream
    //std::ios::out - open file for writing - output mode default for ofstream
    //std::ios::trunc - delete file if exist

    outf.open("file.txt");
    if (!outf) { std::cout << "IO ERROR! cannot open file!\n"; return 1; };

    //outf << "Hello, from C++ file io app!\n";
    //outf << "One more line of text saved in file\n";
    //outf << "Last line! Thats all for now!\n";
    //int num{ 100500 };

    //for (int i{0}; i < 4; ++i)
    //{
    //  std::cout << (int)*((uint8_t*)(&num + i)) << '\n';
    //};

    float val{};
    for (int i{0}; i < 10; ++i)
    {
        val = ((float)i / (rand() % 100 + 1));

        std::cout << "Line number: ";
        std::cout << i << '\n' << val << '\n';
        outf << "Line number:\n";
        outf << i << ' ' << val << '\n';
    }

    outf.close();

    std::ifstream inf;
    inf.open("file.txt");
    if (!inf) { std::cout << "IO ERROR! cannot open file!\n"; return 1; };

    std::cout << "\nTry to read file content: \n";
    char buf[200];
    int numI{};
    float numF{};

    while (!inf.eof())
    {
        inf.getline(buf,200);
        //std::cout << buf << '\n';
        inf >> numI;
        if (inf.fail()) break;
        inf >> numF;
        if (inf.fail()) break;
        std::cout << buf << ' ';
        std::cout << numI << ' ' << numF << '\n';
        inf.ignore(100, '\n');
    }

    inf.close();

}