#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;

int deposit(int x, int y)
{
    int newbal = x + y;
    return newbal;
}

int withdraw(int x, int y)
{
    int newbal = x - y;
    return newbal;
}
int main()
{
    int menu;
    int selection;
    double x = 1000, y;
    int trans;
    char user[20], pass[20], pktc[3];
    string newuser, newpass;

    do{
    system ("CLS");
    cout << "Welcome To Bank" << endl;
    cout << "[1] Register" << endl;
    cout << "[2] Login" << endl;
    cout << "[3] Exit" << endl;
    cout << "nnEnter command: " <<endl;
    cin >> menu;
    switch(menu)
    {

//----------------------------------------------------------------CASE 1------------------------------------------------------------------------------//
//----------------------------------------------------------------REGISTER----------------------------------------------------------------------------//

        case 1:
        system ("CLS");
        cout << "<-------REGISTER------->nn";
        cout << "Enter Name: ";
        cin >> user;
        newuser = user;
        cout << "Enter Password: ";
        cin >> pass;
        newpass = pass;
        cout <<"REGISTERED SUCCESSFULLY!" << endl;
        cout <<"nnPress Any key to contniue" << endl;
        cin >> pktc;
        system ("CLS");

        break;

//------------------------------------------------------------END OF REGISTER--------------------------------------------------------------------------//



//----------------------------------------------------------------CASE 2------------------------------------------------------------------------------//
//-----------------------------------------------------------------LOGIN------------------------------------------------------------------------------//

        case 2:
        system ("CLS");
        cout << "<-------LOGIN------->nn";
        cout << "Enter Username: ";
        cin >> newuser;
        cout << "Enter Password: ";
        cin >> newpass;
        if(newuser != user || newpass != pass)
        {

//-------------------------------------------------------------FAILED LOGIN----------------------------------------------------------------------------//

            cout << "nInvalid account" << endl;
            cout <<"nnPress Any key to contniue" << endl;
            cin >> pktc;
            system ("CLS");
        }
        else if (newuser == user || newpass == pass)
        {

//----------------------------------------------------------------CASE 2.1------------------------------------------------------------------------------//
//------------------------------------------------------------SUCCESFULL LOGIN--------------------------------------------------------------------------//

        system ("CLS");
        cout << "nn<-------------------------------WELCOME------------------------------->nn" << endl;
        cout<<"nWelcome To Banco De Nelio";
        cout<<"nUSERNAME:  "<< user << endl;
        cout<<"nn TIP ATM MACHINE";
        cout<<"n   1. Balance";
        cout<<"n   2. Deposit";
        cout<<"n   3. Withdraw";
        cout<<"n   4. Exit";

do{

cout<<"nnChoose Transaction[1-3]:";
cin>>trans;

switch(trans)
    {

//----------------------------------------------------------------ATM CASE 1------------------------------------------------------------------------------//
//--------------------------------------------------------------CHECK BALANCE--------------------------------------------------------------------------//

        case 1:
        system ("CLS");
        cout << "nn<-------------------------------WELCOME------------------------------->nn" << endl;
        cout<<"nWelcome To Banco De Nelio";
        cout<<"nUSERNAME:  "<< user << endl;
        cout<<"nn TIP ATM MACHINE";
        cout<<"n   1. Balance";
        cout<<"n   2. Deposit";
        cout<<"n   3. Withdraw";
        cout<<"n   4. Exit";
        cout<<"nnYour total balance is: "<< deposit(x, y) ;
        break;

//----------------------------------------------------------------ATM CASE 2------------------------------------------------------------------------------//
//--------------------------------------------------------------BEFORE DEPOSIT--------------------------------------------------------------------------//

        case 2:
        system ("CLS");
        cout << "nn<-------------------------------WELCOME------------------------------->nn" << endl;
        cout<<"nWelcome To Banco De Nelio";
        cout<<"nUSERNAME:  "<< user << endl;
        cout<<"nn TIP ATM MACHINE";
        cout<<"n   1. Balance";
        cout<<"n   2. Deposit";
        cout<<"n   3. Withdraw";
        cout<<"n   4. Exit";
        cout<<"nnEnter the amount:" ;
        cin>>y;

//--------------------------------------------------------------AFTER DEPOSIT--------------------------------------------------------------------------//

        system ("CLS");
        cout << "nn<-------------------------------WELCOME------------------------------->nn" << endl;
        cout<<"nWelcome To Banco De Nelio";
        cout<<"nUSERNAME:  "<< user << endl;
        cout<<"nn TIP ATM MACHINE";
        cout<<"n   1. Balance";
        cout<<"n   2. Deposit";
        cout<<"n   3. Withdraw";
        cout<<"n   4. Exit";
        cout<<"nnYour total balance now is: " << deposit(x, y) <<endl;
        break;

//----------------------------------------------------------------ATM CASE 3------------------------------------------------------------------------------//
//--------------------------------------------------------------WITHDRAW BALANCE--------------------------------------------------------------------------//

        case 3:
        cout<<"nEnter the amount:" ;
        cin>>y;
        if ( y > x)
        {
            cout<<"nYou cannot withdraw " << y;
            cout<<" because the amount is higher than your balance" << endl;
            break;
        }
        else
            x = x - y;
            cout<<"nYour Total Balance is now " << withdraw(x, y) << endl;
            break;

//----------------------------------------------------------------ATM CASE 4------------------------------------------------------------------------------//
//-------------------------------------------------------------------BACK--------------------------------------------------------------------------------//

        case 4:
            cout<<"nnThank You!" << endl;
            break;
        default:
            cout<<"nYou did not enter any valid number" << endl;
            break;
        }
    }while (trans<=3);
        }
        break;

//----------------------------------------------------------------CASE 3------------------------------------------------------------------------------//
//-----------------------------------------------------------------EXIT-------------------------------------------------------------------------------//

        case 3:
        system ("CLS");
        cout << "Thank you for using me!n";
        return 0;
//-------------------------------------------------------------END OF EXIT----------------------------------------------------------------------------//
    }

}while (menu<=3);
}

int add(int x,int y) { return a+b; }
int sub(int x,int y) { return a-b; }

int main() {
    int initial = 0;
    // add 10 then subtract 5
    std::cout << add(initial,10) << 'n';  // prints 10
    std::cout << sub(initial,5) << 'n';   // prints -5
}

int main() {
    int initial = 0;
    // add 10 then subtract 5 and update initial
    initial = add(initial,10);
    std::cout << initial << 'n';
    initial = sub(initial,5);
    std::cout << initial << 'n';
}