Answer to Question #155619 in C++ for Emmy

Question

Each student can open an account in the cafeteria. It has the following features:

·       The system can hold data for 20 students.

·       The student can deposit any amount in his/her account.

·       The student can use the available amount in his/her account to buy lunches or snacks.

·       Menu price list is as below:

Item Cost in PKR

Lunch 150

Snack 100

Drink 50

·       Each student account should have the following details stored:

1.     Roll no (Data type: int, format: BBRRRR, e.g. 201406)

2.     Account No (Data type: int)

3.     Balance (Data type: double)

4.     Student Name (Data type: char array)

{Hint: Use 2D arrays for storing student first and last names: char Student_Name [20][30]}

Functionality

1. Create_Account()

Assign each student a unique account number.

Get student Roll No and Name.

Ask the user for the initial Deposit amount.

2. Display()

Gives all details of a single Account.

3.Deposit_amount()

Updates the Account Balance.

4. Purchase_Item()

Following functionality must be implemented:

·       Displays menu of available items for student to choose

·       The student can select more than one item for purchase

·       Updates the account balance if item can be purchased with the available amount, else notifies if amount balance is not sufficient

5. Store_in_File ()

Writes data of the accounts in use into a file “Record_sys.txt”

6.Display_Sorted()

Sort the entire data on the basis of Roll No. and display it in an ascending order

7. Read_from_file()

At the beginning of your program update all the previously saved data from the file “Record_sys.txt”

Answer 1

#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <iomanip>
#include <fstream>
using namespace std;


class Student {
    
    public: 
        int rollNumber;
        int AccountNumber;
        double balance;
        string studentName;
        
        void Create_Account() {
            srand(time(0));
            // Account number length is 10
            AccountNumber = rand () % 900000000 + 100000000;
            // roll number length is 6 
            rollNumber = rand() % 900000 + 100000;
            cout << "Enter initial deposit amount: ";
            cin >> balance;
            cout << "Enter student name: ";
            cin >> studentName;
        }
        void Display() {
            cout << setw(28) << studentName << " |"<< setw(23) << rollNumber << " |" << setw(23) << AccountNumber << " |" << setw(22) << balance << "$ |\n";
        }
        void Deposit_amount() {
            cout << setw(28) << studentName << " |"<< setw(23) << rollNumber << " |" << setw(23) << AccountNumber << " |" << setw(22) << balance + 120 << "$ |\n";
        }
        void Purchase_Item() {
            cout << "You can purchase in a following prices:\nSelect numbers: |=|=|To stop the order enter 0|=|=|\n";
            cout << "1. Lunch 150\n";
            cout << "2. Snack 100\n";
            cout << "3. Drink 50\n";
            int n = 0, Array[n];
            while (true) {
                int select;
                cin >> select;
                Array[n++] = select;
                if (select == 0) {
                    break;
                }
            }
            float total = 0;
            for (int i = 0; i < n; i++) {
                if (Array[i] == 1) {
                    total += 150;
                }
                if (Array[i] == 2) {
                    total += 100;
                }
                if (Array[i] == 3) {
                    total += 50;
                }
            }
            cout << "Your must pay: " << total << "$ \n";
            if (balance + 120 - total > 0) {
                cout << "Your balance is " << balance + 120 - total << "$ \n";
            }
            if (balance + 120 - total < 0) {
                cout << "Insufficient balance: \n";
            }
        }
        void Store_in_File() {
            ofstream myfile;
            myfile.open ("Record_sys.txt", ios::app);
            myfile << setw(28) << studentName << " |"<< setw(23) << rollNumber << " |" << setw(23) << AccountNumber << " |" << setw(22) << balance << "$ |\n";
            myfile.close();
        }
};


int main () {
    Student student[5];
    
    for (int i = 0; i < 5; i++) {
        cout << "Enter " << i + 1 << " - student details:\n";
        student[i].Create_Account();
    }
    
    cout << setw(30) << "Student Name |" << setw(25) << "Roll Number |" << setw(25) << "Account Number |" << setw(25) << "Student balance |" << endl;
    for (int i = 0; i < 5; i++) {
        student[i].Display();
    }
    
    cout << "\nThe next seen of table each balance of student increases 120$: \n";
    cout << setw(30) << "Student Name |" << setw(25) << "Roll Number |" << setw(25) << "Account Number |" << setw(25) << "Student balance |" << endl;
    for (int i = 0; i < 5; i++) {      
        student[i].Deposit_amount();
    }
    
    cout << "\nField of purchasing:\n";
    for (int i = 0; i < 5; i++) {      
        student[i].Purchase_Item();
    }
    
    for (int i = 0; i < 5; i++) {
        student[i].Store_in_File();
    }
    
    // sorting in a ascending order:
    cout << "\n";
    for (int i = 0; i < 5; i++) {
        for (int j = i + 1; j < 5; j++) {
            if (student[i].rollNumber > student[j].rollNumber) {
                int temp = student[i].rollNumber;
                student[i].rollNumber = student[j].rollNumber;
                student[j].rollNumber = temp;
            }
        }
    }
    for (int i = 0; i < 5; i++) {
        cout << student[i].rollNumber << endl;
    }
    return 0;
}