Ошибка при поиске значения структуры

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
struct Student
{
    string lastname, firstname, middlename;
    int b_day, b_month, b_year;
    char gender;
    int maths, physics, inf;
    int scholarship;
};
 
int main(int argc, char* argv[])
{
    char point = '.';
    ifstream fin("data.txt");
    if (!fin)
    {
        cout << "Error! File is not found" << endl;
        system("pause");
        return 0;
    }
    int count = 0;
    double avrg_schoolarship=0;
    double avrg_schoolarship_procent=0;
    while (!fin.eof())
    {
        Student st;
        fin >> st.lastname >> st.firstname >> st.middlename;
        fin >> st.gender;
        fin >> st.b_day >> point >> st.b_month >> point >> st.b_year;
        fin >> st.maths >> st.physics >> st.inf;
        fin >> st.scholarship;
        if (st.scholarship >= 1)count++;
        avrg_schoolarship += st.scholarship;
    }
    avrg_schoolarship /= count;
    cout << "Average scholarship: " << avrg_schoolarship;
    avrg_schoolarship_procent = (avrg_schoolarship * 20) / 100;
    cout << "\nAverage scholarship (20%): " << avrg_schoolarship_procent;
    avrg_schoolarship -= avrg_schoolarship_procent;
    cout << "\nAverage scholarship (80%): " << avrg_schoolarship;
    while (!fin.eof())
    {
        Student st;
        fin >> st.lastname >> st.firstname >> st.middlename;
        fin >> st.gender;
        fin >> st.b_day >> point >> st.b_month >> point >> st.b_year;
        fin >> st.maths >> st.physics >> st.inf;
        fin >> st.scholarship;
        if (st.scholarship >= 1 && st.scholarship <= avrg_schoolarship) cout << st.lastname << " " << st.firstname << " " << st.middlename << endl;
    }
    fin.close();
    cout << endl;
    system("pause");
    return 0;
}

fin.seekg(0, fin.beg);