C++ Help

#include <sstream>
#include <vector>
#include <string>
#include <fstream>
#include <iostream>
#include "Instructor.h"
#include "Student.h"

using namespace std;

//Global variables
string username;
string password;
Instructor instructor;
Student student;
vector<string> studentVector;
vector<string> instructorVector;
vector<Student> studentList;
vector<Instructor> instructorList;

//The functions in the document are being declared here to resolve scope issues
void handleFiles(int argc, char ** argv);
void loginProcess();
void instructorScope();
void studentScope();

//This is the first method called from main
//handleFiles checks that the files passed in as command line arguments
// and then parses the files into vectors
void handleFiles(int argc, char ** argv) {
    if (argc != 2) {
        cout << "Usage: main [instructors_file] [students_file]";
        exit(1);
    } //if

    try {
        ifstream in;
        string line;
        in.open(argv[0]);
        while (getline(in, line)) {
            stringstream lineStream(line);
            string token;
            while(lineStream >> token) {
                instructorVector.push_back(token);
            } //while
        } //while
        in.close();
        cin.sync();

        //This for loop is initializing all of the instructor objects
        Instructor temp;
        for (int i = 0, j = 0; i < instructorVector.size() / 4; i++) {
            temp.setUsername(instructorVector[j]);
            j++;
            temp.setPassword(instructorVector[j]);
            j++;
            string fullName = instructorVector[j] + " " + instructorVector[j + 1];
            temp.setInstructorName(fullName);
            j += 2;
            instructorList.push_back(temp);
        } //for
    } catch(...) {
        cout << "Error: cannot parse instructors information from file "
             << argv[0];
        exit(1);
    } //try/catch [parsing instructors file]

    try {
        ifstream in;
        string line;
        in.open(argv[1]);
        while (getline(in, line)) {
            stringstream lineStream(line);
            string token;
            while (lineStream >> token) {
                studentVector.push_back(token);
            } //while
        } //while
        in.close();
        cin.sync();

//This for loop is initializing all of the student objects
        Student temp;
        for (int i = 0, j = 0; i < studentVector.size() / 8; i++) {
            temp.setUsername(studentVector[j]);
            j++;
            temp.setPassword(studentVector[j]);
            j++;
            temp.setStudentName(studentVector[j] + " " + studentVector[j+1]);
            j += 2;
            temp.setProjectGrade(stoi(studentVector[j]));
            j++;
            temp.setQuizGrade(stoi(studentVector[j]));
            j++;
            temp.setMidtermGrade(stoi(studentVector[j]));
            j++;
            temp.setFinalGrade(stoi(studentVector[j]));
            j++;
            studentList.push_back(temp);
        } //for
    } catch (...) {
        cout << "Error: cannot parse students information from file "
             << argv[1];
        exit(1);
    } //try/catch [parsing students file]
} //handleFiles

//This handles the entire experience from the Instructor's viewpoint
//It
void instructorScope() {
    bool instructorBool = false;
    string instructorOption;
    while (!instructorBool) {
        cout << "\n"
             << "Query options,"
             << "     1 - view grades of a student"
             << "     2 - view stats"
             << "Enter option number:";
        cin >> instructorOption;

        if (instructorOption == "1" || instructorOption == "2") {
            instructorBool = true;
        } else {
            cout << "\n"
                 << "Invalid option. Please enter a valid option.";
        } //if / else [selecting what to view]
    } //while
    if (instructorOption == "1") {

    } else if (instructorOption == "2") {

    } //if / else if [displaying the content]
} //instructorScope

void studentScope() {
    bool studentBool = false;
    while (!studentBool) {
        string studentOption;
        cout << "\n"
             << "Do you want to view grades (y/n)?";
        cin >> studentOption;
        if (studentOption == "y" || studentOption == "Y") {
            cout << "\n"
                 << "Student name: "
                 << student.getStudentName()
                 << "\n"
                 << "Project    "
                 << student.getProjectGrade()
                 << "%"
                 << "\n"
                 << "Quiz       "
                 << student.getQuizGrade()
                 << "%"
                 << "\n"
                 << "Midterm    "
                 << student.getMidtermGrade()
                 << "%"
                 << "\n"
                 << "Final      "
                 << student.getFinalGrade()
                 << "%"
                 << "\n"
                 << "Overall    "
                 << student.getOverallGrade()
                 << "%"
                 << "\n";
                loginProcess();
        } else if (studentOption == "n" || studentOption == "N") {
            studentBool = true;
            loginProcess();
        } //if / else if
    } //while
} //studentScope

void loginProcess() {
    vector<string> throwAway;
    string throwAwayString;
    while (cin) {
        cin >> throwAwayString;
        throwAway.push_back(throwAwayString);
    } //while
    cout << throwAway.size();
    cin.sync();
    //cin.ignore(256);

    string loginChoice;
    bool whileCondition = false;
    while (!whileCondition) {
        cout << "User types,"
             << "\n"
             << "     1 - Instructor"
             << "\n"
             << "     2 - Student"
             << "\n"
             << "Select a login user type or enter 3 to exit:";
        cin.sync();
        getline(cin, loginChoice);
        //cin >> loginChoice;
        //break;
        cout << "\n"
             << "Login Choice: "
             << loginChoice
             << "end"
             << "\n";

        if (loginChoice == "1" || loginChoice == "2") {
            whileCondition = true;
        } else if (loginChoice == "3") {
            exit(0);
        } //if / else if
    } //while

    bool loginSuccessful = false;
    while (!loginSuccessful) {
        cout << "\n"
             << "Enter credentials to login,"
             << "\n"
             << "     Enter username:";
        cin >> username;
        cout << "\n"
             << "     Enter password: ";
        break;
        cin >> password;

        if (loginChoice == "1") {
            if (instructor.login(username, password)) {
                cout << "\n"
                     << "You are now logged in as instructor "
                     << instructor.getInstructorName()
                     << ".";
                loginSuccessful = true;
                instructorScope();
            } else {
                cout << "\n"
                     << "Login as instructor failed.";
                    } // if / else if [instructor login check]
        } else if (loginChoice == "2") {
            if (student.login(username, password)) {
                cout << "\n"
                     << "You are now logged in as student "
                     << student.getStudentName()
                     << ".";
                loginSuccessful = true;
                studentScope();
            } else {
                cout << "\n"
                     << "Login as student failed.";
                    } //if / else if [student login check]
        } //if / else if [loginChoice check]
    } //while
} //loginProcess

int main(int argc, char **argv) {
    //handleFiles(argc, argv);
    loginProcess(); //I made this into its own method so I can repeatedly call it

    return 0;
} //main