sp3.cpp

#include <iostream>
#include <fstream>
#include <iomanip>

int main(int argc, const char *argv[]){
    std::string name, surname, city;
    std::fstream file;
    file.open("output.txt", std::fstream::in | std::fstream::out | std::fstream::app);
    std::cout << "Write the detail with these format. Press <Ctrl+D> to send EOF to program.\nName Surname City\n";
    if(file.peek() == std::ifstream::traits_type::eof()){
        file << std::left << std::setw(10) << "Name" << std::setw(15) << "Surname" << std::setw(15) << "City" << '\n';
    }
    while(std::cin>> name >> surname >> city){
        file << std::left << std::setw(10) << name << std::setw(15) << surname << std::setw(15) << city << '\n';
    }
    return 0;
}