#include <iostream>
#include <sstream>
#include <vector>
#include <iterator>
#include <algorithm>

int main() {
    std::string numbers = "1 2 3.4 5.6e7";
    std::istringstream in(numbers);
    std::vector<double> result;
    
    std::copy(std::istream_iterator<double>(in), std::istream_iterator<double>(), std::back_inserter(result));
    
    for (auto x : result) {
        std::cout << x << std::endl;
    }
}