![]() The "dispense" state defines only one transition: Waiting -> select -> dispense waiting -> refund -> refunding If, for example, a deposit input signal is encountered, the FSM will move to the "waiting" state, which defines these transitions: Otherwise, the current state is updated and the process is repeated. Any input signal not corresponding to one of those transitions can either trigger an error or be ignored. The variables in bold-face represent transitions. Ready -> deposit -> waiting ready -> quit -> exit The machine is initially in the "ready" state, which maps to exactly two states in the following way: Implicit transitions thus represent "automatic" or sequenced states that are generally processed between explicit transitions (although they can also be used to provide an optional path when no valid transition exists for a given input signal).Ĭonsider the model of a simple vending machine. Transitions can either be explicit or implicit explicit transitions are triggered by an input signal and implicit transitions by the internal state of the system (that is, the current state). An FSM can only be in one state at any given moment. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.Ī Finite state machine (FSM) is computational abstraction which maps a finite number of states to other states within the same set, via transitions. Finite state machine is a draft programming task.
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