int main()
{
    vector<Student_info> students;
    Student_info record;
    string::size_type maxlen=0;

    while (read(cin,record))
    {
    maxlen=max(maxlen,record.name.size());
    students.push_back(record);
    }

    sort(students.begin(),students.end(),compare);

    for (vector<Student_info>::size_type i=0; i!=students.size();i++)
    {
    cout<<students[i].name
        <<string(maxlen+1-students[i].name.size(),' ');

        try
        {
        double final_grade=grade(students[i]);
        streamsize prec=cout.precision();
        cout<<setprecision(3)<<final_grade
            <<setprecision(prec);
            }
        catch (domain_error e)
        {
            cout<<e.what();
        }
        cout<<endl;
    }
return 0;
}

#include "Student_info.h"

using std::istream;
using std::vector;

bool compare(const Student_info& x, const Student_info& y)
{
    return x.name<y.name;
}

istream& read(istream& is, Student_info& s)
{
    is>>s.name>>s.midterm>>s.exam;

    read_hw(is,s.homework);
    return is;
}

istream& read_hw(istream& in, vector<double>& hw)
{
    if (in)
    {
        hw.clear();

        double x;
        while (in>>x)
        hw.push_back(x);

    in.clear();
    }
    return in;
}