After successful transaction, machine undergoes the exit action i.e., ejectcard that discharges the customer’s card. If the pin entered is valid, then the machine further process towards transaction. If the pin entered is not valid then machine will perform exit action. Then the customer enters the pin and ATM machine then reads pin. After the card is being read successfully, the ATM machine will ask for Pin. If the card is not valid then the machine will perform exit action. When the customer inserts the bank or credit card in the ATM’s card reader, the entry action i.e readcard is performed by the ATM machine. In this you will see the processing when the customer performs transactions using ATM card. Now let us see the State Transition Diagram of Automated Teller Machine (ATM) System. In a System, it represents a Composite state with two or more parallel or concurrent states out of which only one state will be active at a time and other states will be inactive. In a System, it represents a Simple state with no substructure. In a System, it represents Starting state. You can use the appropriate stencils of UML notation from UML Activity library with 37 objects. You can see the symbols and their description given below : UML Activity Diagram illustrates the business and operational step-by-step workflows of components in a system and shows the overall flow of control. The System consists of various states that are being represented using various symbols in the state transition diagram.
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