ifstream 仅读取数据 3 次

问：

我有一个代码，我需要计算每个性别的人数、gpa 的总和以及 gpa 的平均值。尽管男性和女性计数之间的代码几乎相同，但它没有从第二个循环的文件中读取任何信息。

#include<iostream>
#include<iomanip>
#include<fstream>
using namespace std;

void openFiles(ifstream& read, ofstream& write)
{
    read.open("StudentsPreformanceData.txt");

    if (read.is_open())
        cout << "File Opened" << endl;
    else
        cout << "Error try again";

    write.open("Results.txt");
    write << fixed << showpoint << setprecision(2);
}
void initialize(int& countFemale, int& countMale, double& sumFemale, double& sumMale)
{
    countFemale = 0;
    countMale = 0;
    sumFemale = 0.00;
    sumMale = 0.00;
}
void sumGrades(ifstream& read, double& sum, char gender)
{
    char student;
    double grade;
    while (!read.eof())
    {
        read >> student;
        read >> grade;
        if (student == gender)
            sum = sum + grade;

        //cout << student << " " << grade << " " << sum << endl;
    }
    read.close();
}
double averageGrades(ifstream& read, double sum, int& count, char gender)
{
    char student;
    double grade;
    while (!read.eof())
    {
        read >> student;
        read >> grade;
        if (student == gender)
        {
            count = count + 1;
        }
        cout << student << " " << count << " " << sum << endl;
    }
    return sum / count;
    read.close();
}
void printResults()
{

}

int main()
{
    ifstream read;
    ofstream write;
    openFiles(read, write);

    int countFemale, countMale;
    double sumFemale, sumMale;
    initialize(countFemale, countMale, sumFemale, sumMale);

    cout << countFemale << sumFemale << countMale << sumMale << endl;

    sumGrades(read, sumFemale, 'f');
    cout << countFemale << " " << sumFemale << " " << countMale << " " << sumMale << endl;

    openFiles(read, write);

    sumGrades(read, sumMale, 'm');
    cout << countFemale << " " << sumFemale << " " << countMale << " " << sumMale << endl;

    openFiles(read, write);

    averageGrades(read, sumMale, countMale, 'm');
    cout << countFemale << " " << sumFemale << " " << countMale << " " << sumMale << endl;

    openFiles(read, write);

    averageGrades(read, sumFemale, countFemale, 'f');
    cout << countFemale << " " << sumFemale << " " << countMale << " " << sumMale << endl;
}

附图是我的输出

我很困惑，因为我尝试交换男性和女性的位置，再一次，第二名不算数。代码打印出打开的文件，所以我知道它正在打开，我只是不知道为什么它不会在代码中的那个时候第四次运行列表。