ATM machine

As owners of AwesomeSuperPuperBank, we want to have a simple prototype of our new ATM machine that allows our customers to:

• view their account balance
• withdraw money

Our bank already has two clients: Volodymyr and Iryna. The bank also has liquid assets (i.e. cash) in the amount of ₴337 (in different banknotes) which our ATM machine can operate with.

banknotes:  500: 0  200: 0  100: 2  50: 1  20: 2  10: 4  5: 1  2: 0  1: 2
accounts:  

3321:

     name: 'Volodymyr'    

     password: 'mypass'    

     balance: 422  5922:    

5922:

     name: 'Iryna'    

     password: 'ho#ll_§1'    

      balance: 5301

Here’s one of possible application flows: 

Please Enter Your Account Number:

> 3321 Enter Your Password:

> mypass 

Hello, Volodymyr!

 Please Choose From the Following Options: 1. Display Balance 2. Withdraw 3. Log Out 

> 1 

Your Current Balance is ₴422 

Please Choose From the Following Options: 1. Display Balance 2. Withdraw 3. Log Out 

> 2 

Enter Amount You Wish to Withdraw:

> 100000 

ERROR: INSUFFICIENT FUNDS!! PLEASE ENTER A DIFFERENT AMOUNT:

> 420 

ERROR: THE MAXIMUM AMOUNT AVAILABLE IN THIS ATM IS ₴337. PLEASE ENTER A DIFFERENT AMOUNT:

> 329 

ERROR: THE AMOUNT YOU REQUESTED CANNOT BE COMPOSED FROM BILLS AVAILABLE IN THIS ATM. PLEASE ENTER A DIFFERENT AMOUNT:

> 320 

Your New Balance is ₴102 

Please Choose From the Following Options: 1. Display Balance 2. Withdraw 3. Log Out 

> 1 

Your Current Balance is ₴102 

Please Choose From the Following Options: 1. Display Balance 2. Withdraw 3. Log Out 

> 3 

Volodymyr, Thank You For Using Our ATM. Good-Bye!

 Please Enter Your Account Number:

> 5922 Enter Your Password:

> 1234567 

ERROR: ACCOUNT NUMBER AND PASSWORD DON'T MATCH



Please Enter Your Account Number:

> 5922

Enter Your Password:

> ho#ll_§1



Hello, Iryna!

...