#include <iostream>
#include <string>
 
bool read_double(std::istream & is, double & number)
{
    std::string line;
    getline(is, line);
    std::size_t pos = 0;
    double temp = stod(line, &pos);
    if (pos != line.size()) // there is extra content in the streams
        return false;
    number = temp;
    return true;
}
 
 
int main()
{ 
    double foo;
    std::cout << read_double(std::cin, foo);
    std::cout << read_double(std::cin, foo);
    std::cout << read_double(std::cin, foo);
}

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MS41ZG9nCjEuNWU1ZG9nCjEuNWUz

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