文件IO循环错误

我有一个readFile函数，它应该从文本文件中识别学生的类型。如果它的国籍是本地的，它将创建一个localstudent类，并将所有细节存储到localstudentobject中，并将其push_back存储到向量中。国际学生也是如此。当我使用cout检查向量的大小如何增加时，它会显示大小增加了3倍，这意味着我的函数循环了3次。我该怎么解决这个问题？

文件中的输入

Local   Bob 1 12 2003   Female  3   34  5345    345 3131    Bob 12313   1 12 2003   12 12 2000  1231    3   3   4   115.476 1346.48 258.75  4   234
Local   Tom 1/12/2003   male    3   34  5345    345 3131    Tom 12313   1/12/2003   12/12/2000  1231    3   3   4   115.476 1346.48 258.75  4   234

输出将显示Bob一次和Tom两次的详细信息。我知道在.of（）中是错误的，但我不知道有任何其他方法可以循环使用。

void readFile(vector <clsStudent*> &s)
{
    string name, IC_no,state, gender, accNumb, accName, progName, ReadNationality, progCode, passportNumber, nation, visa, scholarship;
    int accID, times;
    float GPA, discountedFees, principle, rate, years, CI, C_Amount, progFees;
    clsDate DOB, accStart, accDOB, expDate;
    string line;
    ifstream in(filename);
    while(in)
    {
       if(in)
        {
            in >> ReadNationality;
            in >> name;
            in >> DOB;
            in >> gender;
            in >> GPA;
            in >> progName;
            in >> progCode;
            in >> progFees;
            in >> accNumb;
            in >> accName;
            in >> accID;
            in >> accDOB;
            in >> accStart;
            in >> principle;
            in >> rate;
            in >> years;
            in >> times;
            in >> CI;
            in >> C_Amount;
            in >> discountedFees;
            if (ReadNationality == "Local")
            {
                clsLocalStudent *stud;
                stud = new clsLocalStudent();
                in >> IC_no;
                in >> state;
                clsUniversityProgram *program= new clsUniversityProgram(progName, progCode, progFees);
                clsAccount objAccount(accNumb,name,accID, accDOB, accStart, principle, rate, years, times);
                stud->setName(name);
                stud->setDateOfBirth(DOB);
                stud->setGender(gender);
                stud->setNationality(ReadNationality);
                stud->setGPA(GPA);
                stud->setProgram(program);
                stud->setAccounts(objAccount);
                stud->setIC(IC_no);
                stud->setState(state);
                s.push_back(stud);
            }
            else
            {
                clsInternationalStudent *stud;
                stud = new clsInternationalStudent();
                in >> passportNumber;
                in >> nation;
                in >> visa;
                in >> expDate;
                in >> scholarship;
                clsUniversityProgram program(progName, progCode, progFees);
                clsAccount objAccount(accNumb,name,accID, accDOB, accStart, principle, rate, years, times);
                stud->setName(name);
                stud->setDateOfBirth(DOB);
                stud->setGender(gender);
                stud->setNationality(ReadNationality);
                stud->setGPA(GPA);
                stud->setProgram(&program);
                stud->setAccounts(objAccount);
                stud->setPassportNo(passportNumber);
                stud->setNation(nation);
                stud->setStudentVisa(visa);
                stud->setExpiryDate(expDate);
                stud->setScholarship(scholarship);
                s.push_back(stud);
            }
        }
        else
        cerr << "nCannot open " << filename << " for reading" << endl;
    cout << s.size();
    }

    in.close();
}
void operator >> (istream &is, clsDate &date)
{
    string inputDate;
    int dd, mm, yy;
    char separator;
    is >> dd >> separator >> mm >> separator >> yy;
    date.setSeparator(separator);
    date.setMM(mm);
    date.setDD(dd);
    date.setYY(yy);
}