Coursework system coding help i did most fo it but i am still ahving trouble

See more:

C++

VBA

We have to create a coursework system where the student uploads an assignment to be graded. Once the professor grades it the student can look at what they got and also see comments made by the professor... kind of like how my school has us submit our assignments online to be graded... so from that I have some code. But I got so confused mainly because iI'm in software engineering(400 level course) but just now taking c++. How can I convert this into a form would that be easier?? well here is the code

#include <iostream>
#include <iomanip>
#include <fstream>

using namespace std;

const int numStudents = 25, numQuiz = 30, numAssign = 30, numFinal = 1, nummidterm = 1;
const int totalGrades = 21;
void computeStudAver(const int grade[][numQuiz], double stAve[]);
void computeQuizAver(const int grade[][numQuiz], double quizAve[]);
void printall(const int grade[][numQuiz]);

int menu();
int main();

int menu()
{
    char choice;
    cout << "N. New Semester."<<endl;
    cout << "O. Output Data."<<endl;
    cout << "E. Exit"<< endl << endl;
    cin >> choice;
    cout << endl << endl;
    return choice = main();
}

int calcgrade(double average, char& grade)
{
    if (average <= 59)
    grade = 'F';
    else if (average <= 69 && average >= 60)
    grade = 'D';
    else if (average <= 79 && average >= 70)
    grade = 'C';
    else if (average <= 89 && average >= 80)
    grade = 'B';
    else if (average >= 90 && average <= 100)
    grade = 'A';
    return 0;
}

//void scales() { // midterm= 25%; Final = 25%; Quizzes = 25%; Assignments = 25%
//    int quiz = .25 * qgrade = double q


void inputgrades() {
    char fanswer;
    int quizN, assignG, final,midterm,;
    double qgrade[4], agrade[4], fgrade[1],mgrade[1]qsum;

    cout << "How many quiz grades will you add per student?";
    cin >> quizN;
    for (int i = 1; i <= quizN; i++) {
         cout << "Enter quiz grade: " << endl;
         cin >> ++qgrade[i];
    qsum =+qgrade[i];
    }

    cout << "How many assignment grades will you add per student?";
    cin >> assignG;
    for (int i = 1; i <= assignG; i++) {
         cout << "Enter assignment grade: " << endl;
         cin >> agrade[i];
    }
   cout << "Is there a midterm?";
    cin >> manswer;
    if (manswer == 'y' || manswer == 'Y') {
         cout << "Enter midterm grade: " << endl;
         cin >> mgrade[1];
    }
    cout << "Is there a final?";
    cin >> fanswer;
    if (fanswer == 'y' || fanswer == 'Y') {
         cout << "Enter final grade: " << endl;
         cin >> fgrade[1];
    }

    //scales();
}

void computeStudAver(const int grade[][numQuiz], double stAve[]) {
     int stNum;
     for (int stN = 1; stN <= numStudents; stNum++) {
         double sum = 0;
         for (int quizNum = 1; quizNum <= numQuiz; quizNum++)
             sum = sum + grade[stNum-1][quizNum-1];
         stAve[stNum-1] = sum/numQuiz;
         }
}

void computeQuizAver(const int grade[][numQuiz], double quizAve[]) {
     for (int quizNum = 1; quizNum <= numQuiz; quizNum++) {
         double sum = 0;
         for (int stN = 1; stN <= numStudents; stN++)
             sum = sum + grade[stN-1][quizNum-1];
         quizAve[quizNum-1] = sum/numStudents;
     }
}

void printall(const int grade[][numQuiz], const double stAve[], const double quizAve[]) {
     cout.setf(ios::fixed);
     cout.setf(ios::showpoint);
     cout.precision(1);

     ofstream outFile ("GRADEDATA.txt");

     outFile.open("C:\\Documents and Settings\\USER\\Desktop\\output1.txt");
     outFile << setw(10) << "Student" << setw(5) << "Average" << setw(15) << "Quizzes\n";
     for (int stN = 1; stN <= numStudents; stN++) {
              cout << setw(10) << stN << setw(5) << stAve[stN-1] << " ";
         for (int quizNum = 1; quizNum <= numQuiz; quizNum++)
             cout << setw(5) << grade[stN-1][quizNum-1];
         cout << endl;
         }

     cout << "Quiz averages = ";
     for (int quizNum = 1; quizNum <= numQuiz; quizNum ++)
         cout << setw(5) << quizAve[quizNum-1];
     cout << endl;
}

int main()
{
    int grade[numStudents][numQuiz];
    double stAve[numStudents];
    double quizAve[numQuiz];

    char choice;
    cout << "N.New semester."<<endl;
    cout << "O. Output Data."<<endl;
    cout << "E. Exit"<< endl << endl;
    cin >> choice;
    cout << endl << endl;

        switch(choice)
        {
        case 'N':
        case 'n':
            cout << "Welcome. You have begun a new semester!\n";
            inputgrades();
            break;

        case 'O':
        case 'o':
            printall(grade, stAve, quizAve);
            break;

        case 'E':
        case 'e':
            cout << "Quitting..." << endl;
            break;

        default:
            cout << "You must pick one to continue!" << endl;
            break;
        }

    computeStudAver(grade, stAve);
    computeQuizAver(grade, quizAve);
    printall(grade, stAve, quizAve);
    getche();
    return 0;
}

[modified: removed an extra pre tag...also fixed some spelling errors, dangling modifiers, and run-on sentences.]

[MOVED FROM OP ANSWER]
A coursework submission system
This system should manage the electronic submission of assignments from students to instructors. It should keep track of which students have submitted assignments and should allow instructors to manage the grading of assignments. It should provide summaries of student grades and facilities for electronically returning information to students. You might consider some kind of annotation system where instructors could comment on electronic versions of students' work. If you cover security in your courses, you could include encryption facilities in the system.