main.cpp

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
#include <cstring>
#include <limits>
#include <iterator>
#include "Student.h"
#include "Instructor.h"

using namespace std;

/* A method to print the greeting to the user */
void printGreeting() {
    cout << "User types,\n\t1 - Instructor\n\t2 - Student" << endl;
} // printGreeting

/* A method for creating an array of student objects based on text file input. */
void createStudents(Student students[], int numStuds) {

    int i = 0;
    ifstream sFile ("students.txt");

    if (sFile.is_open()) {

        string username, password, fname, lname;
        int pgrade, qgrade, mgrade, fgrade;

        while (sFile >> username >> password >> fname >> lname >> pgrade >>
               qgrade >> mgrade >> fgrade && i < numStuds) {
            students[i].setUserName(username);
            students[i].setPassword(password);
            students[i].setStudentName(fname, lname);
            students[i].setProjectGrade(pgrade);
            students[i].setQuizGrade(qgrade);
            students[i].setMidtermGrade(mgrade);
            students[i].setFinalGrade(fgrade);
            i = i + 1;
        }
    }
    sFile.close();
} // createStudents

/* A method for creating an array of instructor objects based on text file input. */
void createInstructors(Instructor instructors[], int numInsts) {

    int j = 0;
    ifstream iFile("instructors.txt");

    if (iFile.is_open()) {
        string username, password, fname, lname;
        while(iFile >> username >> password >> fname >> lname && j < numInsts) {
            instructors[j].setUserName(username);
            instructors[j].setPassword(password);
            instructors[j].setInstructorName(fname, lname);
            j = j + 1;
        }
    }
    iFile.close();
} // createInstructors

/* The method to run if an instructor account is selected. */
int instructorAccount(Instructor instructors[], Student students[], int numInsts, int numStuds) {

    Student stu;
    Instructor inst;
    string iUser, iPass, sUser;
    int query;

    // login loop
    cout << "Enter credentials to login, \n\tEnter username: ";
    cin >> iUser;
    cout << "\tEnter password: ";
    cin >> iPass;

    while(1) {
        for (int i = 0; i < numInsts; i++) {
            if (instructors[i].login(iUser, iPass)) {
                cout << "You are now logged in as instructor " <<
                    instructors[i].getInstructorName() << "." << endl;
                while (1) {
                    inst = instructors[i];
                    cout << "Query options,\n\t1 - view grades of a student\n\t2 - view stats"
                         << endl;
                    cout << "Enter option number: ";
                    cin >> query;
                    if (query == 1) {
                        while(1) {
                            cout << "Enter student username to view grades: ";
                            cin >> sUser;
                            stu = inst.getStudent(students, sUser, numStuds);
                            if (stu.isSet()) {
                                cout << "Student name: " << stu.getStudentName() << endl;
                                cout << "\tProject\t" << stu.getProjectGrade() << "%" << endl;
                                cout << "\tQuiz\t" << stu.getQuizGrade() << "%" << endl;
                                cout << "\tMidterm\t" << stu.getMidtermGrade() << "%" << endl;
                                cout << "\tFinalt\t" << stu.getFinalGrade() << "%" << endl;
                                cout << "\tOverall\t" << stu.getOverallGrade() << "%" << endl;
                                return 0;
                            }
                        }
                    } else if ( query == 2) {
                        while (1) {
                            int gradeType;
                            cout << "Grade types,\n\t1 - Project grade\n\t2 - Quiz grade\n\t3 - Midterm grade\n\t4 - Final grade\n\t5 - Overall grade\nSelect a grade type to view stats: ";
                            cin >> gradeType;
                            if (gradeType == 1) {
                                cout << "Project grade stats,\n\tmin\t";
                                inst.getMinStudent(students, 1, numStuds);
                                cout << "\tmax\t";
                                inst.getMaxStudent(students, 1, numStuds);
                                cout << "\tavg\t";
                                inst.getAvg(students, 1, numStuds);
                                return 0;
                            } else if (gradeType == 2) {
                                cout << "Quiz grade stats,\n\tmin\t";
                                inst.getMinStudent(students, 2, numStuds);
                                cout << "\tmax\t";
                                inst.getMaxStudent(students, 2, numStuds);
                                cout << "\tavg\t";
                                inst.getAvg(students, 2, numStuds);
                                return 0;
                            } else if (gradeType == 3) {
                                cout << "Midterm grade stats,\n\tmin\t";
                                inst.getMinStudent(students, 3, numStuds);
                                cout << "\tmax\t";
                                inst.getMaxStudent(students, 3, numStuds);
                                cout << "\tavg\t";
                                inst.getAvg(students, 3, numStuds);
                                return 0;
                            } else if (gradeType == 4) {
                                cout << "Final grade stats,\n\tmin\t";
                                inst.getMinStudent(students, 4, numStuds);
                                cout << "\tmax\t";
                                inst.getMaxStudent(students, 4, numStuds);
                                cout << "\tavg\t";
                                inst.getAvg(students, 4, numStuds);
                                return 0;
                            } else if (gradeType == 5) {
                                cout << "Overall grade stats,\n\tmin\t";
                                inst.getMinStudent(students, 5, numStuds);
                                cout << "\tmax\t";
                                inst.getMaxStudent(students, 5, numStuds);
                                cout << "\tavg\t";
                                inst.getAvg(students, 5, numStuds);
                                return 0;
                            } else {
                                cout << "Invalid option. Please enter a valid option." << endl;
                                cin.clear();
                                cin.ignore(numeric_limits<streamsize>::max(), '\n');
                            }
                        }
                    } else {
                        cout << "Invalid option. Please enter a valid option." << endl;
                        cin.clear();
                        cin.ignore(numeric_limits<streamsize>::max(), '\n');

                    } // instructor decision loop.
                }
            }

        }
        cout << "Login as instructor failed." << endl;
        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');
        return 0;
    }

    return 0;
} // instructorAccount

/* The method to run if a student account is selected. */
int studentAcccount(Student students[], int numStuds) {

    string sUser, sPass, viewGrades;
    int i;

    cout << "Enter credentials to login, \n\tEnter username: ";
    cin >> sUser;
    cout << "\tEnter password: ";
    cin >> sPass;

    // main loop of student account
    while(1) {
        for (i = 0; i < numStuds; i++) {
            if (students[i].login(sUser, sPass)) {
                while (1) {
                    cout << "You are now logged in as student " <<
                        students[i].getStudentName() << endl;
                    cout << "Do you want to view grades? (y/n)? ";
                    cin >> viewGrades;
                    if (viewGrades == "y") {
                        cout << "Student name: " << students[i].getStudentName() << endl;
                        cout << "\tProject\t" << students[i].getProjectGrade() << "%" << endl;
                        cout << "\tQuiz\t" << students[i].getQuizGrade() << "%" << endl;
                        cout << "\tMidterm\t" << students[i].getMidtermGrade() << "%" << endl;
                        cout << "\tFinalt\t" << students[i].getFinalGrade() << "%" << endl;
                        cout << "\tOverall\t" << students[i].getOverallGrade() << "%" << endl;
                        return 0;
                    } else if (viewGrades == "n") {
                        return 0;
                    } else {
                        cout << "Invalid option, please try again." << endl;
                        cin.clear();
                        cin.ignore(numeric_limits<streamsize>::max(), '\n');
                    }
                }
            }
        }
        cout << "Login as student failed" << endl;
        cin.clear();
        cin.ignore(numeric_limits<streamsize>::max(), '\n');
        return 0;
    }
    return 0;
} // studentAccount

int main(int argc, char *argv[]) {

    int numStuds, numInsts, userType;

    /* Check that program was launched with correct files. */
    if (argc != 3) {
        cout << "Usage: main [instructors_file] [students_file]" << endl;
        return 1;
    } else if (strcmp(argv[1], "instructors.txt") != 0 || strcmp(argv[2], "students.txt") != 0) {
        cout << "Usage: ./main instructors.txt students.txt" << endl;
        return 1;
    }

    // Check the number of lines in the files for the number of students/instructors to be created.
    string sline, iline;
    ifstream sFile("students.txt");
    while (getline(sFile, sline)) {
        numStuds ++;
    }
    ifstream iFile("instructors.txt");
    while (getline(iFile, iline)) {
        numInsts++;
    }

    //Dynamic arrays based on the number of lines in each file.
    Student * students = new Student[numStuds];
    Instructor * instructors = new Instructor[numInsts];

    // Create Instructors and Students arrays by reference.
    createInstructors(instructors, numInsts);
    createStudents(students, numStuds);

    cout << "Parsing instructors and students information success.\n..." << endl;

    /* While loop where the user interacts*/
    while(1) {
        printGreeting();
        cout << "Select a login user type or enter 3 to exit: ";
        cin >> userType;
        if (userType == 1) {
            instructorAccount(instructors, students, numInsts, numStuds);
        } else if (userType == 2) {
            studentAcccount(students, numStuds);
        } else if (userType == 3) {
            delete[] instructors;
            delete[] students;
            return(0);
        } else {
            //clear cin so it only displays error once.
            cerr << "Invalid option. Please enter a valid option." << endl;
            cin.clear();
            cin.ignore(numeric_limits<streamsize>::max(), '\n');
        } // main interface loop.
    } // while

    return 0;
} // main