-- create a bank account and do some account action:
alicesaccount = BankAccount.new("Alice", 100)
alicesaccount:deposit(20);
alicesaccount:deposit(30);
alicesaccount:deposit(40);

bobsaccount = BankAccount.new("Bob", 200)
bobsaccount:withdraw(10);
bobsaccount:withdraw(15);
bobsaccount:withdraw(20);

-- create a function
function printaccountbalance(account)
    local name = account:getOwnerName()
    local balance = account:checkBalance()
    print(string.format("%s has $%d", name, balance))
end

-- print for debug :
printaccountbalance(alicesaccount)
printaccountbalance(bobsaccount)
print(string.format("The bank has $%d", BankAccount.checkTotalMoneyInBank()))