LuaExample1

-- Kaizer here. I created a banking system, which allows you to create your own account, withdraw money, input account numbers, initial balance, and so on and so forth.

-- class to represent a bank account
local Account = {}
Account.__index = Account

-- constructor for initializing account details
function Account.new(accNumber, accHolder, initialBalance)
    local self = setmetatable({}, Account)
    self.accountNumber = accNumber
    self.accountHolder = accHolder
    self.balance = initialBalance
    return self
end

-- function to find an already existing account number
function Account:getAccountNumber()
    return self.accountNumber
end

-- function to deposit money into the account
function Account:deposit(amount)
    if amount > 0 then
        self.balance = self.balance + amount
        print("Deposited: " .. amount)
    else
        print("Invalid deposit amount.")
    end
end

-- function to withdraw money from the account
function Account:withdraw(amount)
    if amount > 0 and amount <= self.balance then
        self.balance = self.balance - amount
        print("Withdrew: " .. amount)
    else
        print("Invalid withdrawal amount or insufficient funds.")
    end
end

-- function to check the account balance
function Account:getBalance()
    return self.balance
end

-- function to display account details
function Account:display()
    print("Account Number: " .. self.accountNumber)
    print("Account Holder: " .. self.accountHolder)
    print("Balance: " .. self.balance)
end

-- Class to manage multiple accounts
local Bank = {}
Bank.__index = Bank

function Bank.new()
    local self = setmetatable({}, Bank)
    self.accounts = {}
    return self
end

-- function to create a new account
function Bank:createAccount(accNumber, accHolder, initialBalance)
    table.insert(self.accounts, Account.new(accNumber, accHolder, initialBalance))
    print("Account created successfully.")
end

-- function to find an account by account number
function Bank:findAccount(accNumber)
    for _, account in ipairs(self.accounts) do
        if account:getAccountNumber() == accNumber then
            return account
        end
    end
    return nil
end

-- function to display all accounts
function Bank:displayAllAccounts()
    for _, account in ipairs(self.accounts) do
        account:display()
        print("-------------------")
    end
end

local function main()
    local bank = Bank.new()
    local choice
    local accNumber, accHolder, amount

    repeat
        print("1. Create Account")
        print("2. Deposit")
        print("3. Withdraw")
        print("4. Check Balance")
        print("5. Display All Accounts")
        print("6. Exit")
        io.write("Enter your choice: ")
        choice = tonumber(io.read())

        if choice == 1 then
            io.write("Enter account number: ")
            accNumber = io.read()
            io.write("Enter account holder name: ")
            accHolder = io.read()
            io.write("Enter initial balance: ")
            amount = tonumber(io.read())
            bank:createAccount(accNumber, accHolder, amount)
        elseif choice == 2 then
            io.write("Enter account number: ")
            accNumber = io.read()
            local account = bank:findAccount(accNumber)
            if account then
                io.write("Enter amount to deposit: ")
                amount = tonumber(io.read())
                account:deposit(amount)
            else
                print("Account not found.")
            end
        elseif choice == 3 then
            io.write("Enter account number: ")
            accNumber = io.read()
            local account = bank:findAccount(accNumber)
            if account then
                io.write("Enter amount to withdraw: ")
                amount = tonumber(io.read())
                account:withdraw(amount)
            else
                print("Account not found.")
            end
        elseif choice == 4 then
            io.write("Enter account number: ")
            accNumber = io.read()
            local account = bank:findAccount(accNumber)
            if account then
                print("Balance: " .. account:getBalance())
            else
                print("Account not found.")
            end
        elseif choice == 5 then
            bank:displayAllAccounts()
        elseif choice == 6 then
            print("Exiting...")
        else
            print("Invalid choice. Please try again.")
        end
    until choice == 6
end

main()