#include <iostream>
using namespace std;

void menu(double balance);
double deposit(double balance);
double makeBalance();
double makeWithdraw(double balance);
double deposit(double balance);

int main () {
    double balance;
    menu(balance);
}

void menu(double balance) {
    cout << "Please make a choice, current balance: " << balance << endl;
    cout <<"1. Enter a starting balance" << endl;
    cout <<"2. Make a deposit" << endl;
    cout << "3. Make a withdrawal" << endl;
    cout <<"-1. Quit System" << endl;
    int input;
    cin >> input;
    if (input == 1) {
        balance = makeBalance();
        menu(balance);
    } else if (input == 2) {
        balance = deposit(balance);
        menu(balance);
    } else if (input == 3) {
        balance = makeWithdraw(balance);
        menu(balance);
    } else if (input != -1) {
        cout << "Invalid input, try again..." << endl;
        menu(balance);
    } if (input == -1) {
        cout << "System Quit End Balance: " << balance << endl;
    }
}

double makeBalance() {
    cout << "Please enter a starting balance: ";
    double userIn;
    cin >> userIn;
    cout <<"End balance: " << userIn << endl;
    return userIn;
}

double deposit(double balance) {
    cout << "Please enter an amount to deposit: ";
    double depositInput;
    cin >> depositInput;
    balance = balance + depositInput;
    cout << "End balance: " << balance << endl;
    return balance;
}

double makeWithdraw(double balance) {
    cout << "Please enter an amount to withdraw: ";
    double withdrawAmount;
    cin >> withdrawAmount;
    balance = balance - withdrawAmount;
    cout << "End balance: " << balance << endl;
    return balance;
}

// OUTPUT:
Please make a choice, current balance: 0
1. Enter a starting balance
2. Make a deposit
3. Make a withdrawal
-1. Quit System
4
Invalid input, try again...
Please make a choice, current balance: 0
1. Enter a starting balance
2. Make a deposit
3. Make a withdrawal
-1. Quit System
1
Please enter a starting balance: 1000
End balance: 1000
Please make a choice, current balance: 1000
1. Enter a starting balance
2. Make a deposit
3. Make a withdrawal
-1. Quit System
2
Please enter an amount to deposit: 500
End balance: 1500
Please make a choice, current balance: 1500
1. Enter a starting balance
2. Make a deposit
3. Make a withdrawal
-1. Quit System
3
Please enter an amount to withdraw: 750
End balance: 750
Please make a choice, current balance: 750
1. Enter a starting balance
2. Make a deposit
3. Make a withdrawal
-1. Quit System
-1
System Quit End Balance: 750