System

#include <fstream>
#include <iostream>
#include <cstdlib>
using namespace std;
int main()
{
    string g;
    string e;
    char degree[30];
    char b[30];
    int a;
    string k;
    int c;
    int j;
    float y;
    float w;
    float m;
    int n;
    string d;
    string duser, dpass;
    string inputuser, inputpass;
    string data,data2;
    ifstream infile;
    infile.open("Security.txt");
    getline(infile,data);
    duser = data;
    getline(infile,data);
    dpass = data;

    cout << "Student Information System \n";
    cout << "Login \n";
        cout << "Username: ";
    cin >> inputuser;
        cout << "\nPassword: ";
    cin >> inputpass;
    while (inputuser != duser || inputpass != dpass)
    {
        cout << "Incorrect! Please relogin \n";
        cout << "Username: \n";
        cin >> inputuser;
        cout << "\nPassword: ";
        cin >> inputpass;
     }
     if (inputuser == duser && inputpass == dpass)
     {
        system("pause");
        system("cls");
        cout << "Welcome to Student Information System! \n";
     }
cout << "1. Student Information \n";
cout << "2. Quit \n";
cin >> j;

if (j == 1)
{
    cout << "   1. Add \n";
    cout << "   2. Edit \n";
    cout << "   3. Back to Main Menu \n";
    cin >> c;
    if (c==1)
    {
            cout << "Enter your ID Number: ";
            cin >> k;
            k+= ".txt";
            ofstream addfile;
            addfile.open(k.c_str());
        cout << "Input name: ";
        cin.getline(b,30);
        getline(cin,data);
        addfile << data << endl;
        cout <<"Enter your College Year: ";
        cin >> a;
    while( a < 0 || a > 4)
    {
        cout <<"Grade level not recognized! Re Enter Grade level! ";
        cin >> a;
    }

  addfile << a << endl;
   cin.ignore();
    cout << "Enter your Degree and Specialization: ";
    getline(cin,data);
    addfile << data << endl;
    cout <<"Enter your Section: ";
    getline(cin,data);
    addfile << data << endl;
    cout <<"Enter your Academic Year: ";
    getline(cin,data);
    addfile << data << endl;
    cout <<"Enter your Subject: ";
    getline(cin,data);
    addfile << data << endl;

    cout <<"Enter your midterm grade: ";
    cin >> y;
    while (y<60 || y > 100)
    if (y<60)
    {
        cout <<"Invalid Grade! Please re enter Midterm Grade! ";
        cin >> y;
    }
    else if (y>100)
    while (y>100 || y < 60)
    {
        cout <<"Invalid Grade! Please re Midterm Grade! ";
        cin >> y;
    }
addfile << y << endl;
    cout <<"Enter your final grade: ";
    cin >> w;
    if (w<60)
    while (w < 60 || w > 100)
    {
        cout <<"Invalid Grade! Please re enter Final Grade! ";
        cin >> w;
    }
    else if (w>100)
    while (w > 100 || w < 60)
    {
        cout <<" Invalid Grade! Please re enter Final Grade! ";
        cin >> w;
    }

addfile << w << endl;
    m =(y + w) / 3;
    cout <<"Here is your total grade: " << m;
    if (m<60)
    {
        cout <<" No Grade! Please re enter again! \n";
    }
    else if (m>100)
    {
        cout <<" No Grade! Please re enter again! \n";
    }
    addfile << m << endl;
    }
    else if (c==2)
    {
            cout << "Please input the ID Number you wish to read ";
            cin >> d;
            d+=".txt";
            ifstream myfile;
            myfile.open(d.c_str());
            getline(myfile,data);
            cout <<"Full name: " << data << endl;
             getline(myfile,data);
            cout << "College Year: " << data << endl;
             getline(myfile,data);
            cout << "Degree & Specialization: " << data << endl;
            getline(myfile,data);
            cout << "Section: " << data << endl;
             getline(myfile,data);
            cout << "School Year: " << data << endl;
             getline(myfile,data);
            cout << "Subject: " << data << endl;
             getline(myfile,data);
            cout << "Midterm Grade: " << data << endl;
             getline(myfile,data);
            cout << "Final Grade: " << data << endl;
             getline(myfile,data);
            cout << "Total Grade: " << data << endl;
             getline(myfile,data);
            cout << data << endl;

    }
    else if ( c==3 )
    {
        cout << "1. Student Information \n";
        cout << "2. Quit \n";
        cin >> j;
    }
    else if (j == 2)
    {
        cout << "Goodbye! ";
        return EXIT_SUCCESS;
}
}
}