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9.1 Overview
BHT-BASIC supports event polling and two types of trapping: error trapping and event
trap-ping.
– Event polling
– Trapping
Error trapping
Event (of keystroke) trapping
Event Polling
Event PollingEvent Polling
Event Polling
Makes programs monitor the input devices for occurrence of events.
Error Trapping
Error TrappingError Trapping
Error Trapping
Traps a run-time error and handles it by interrupt to transfer control to the error-handling
routine.
If a run-time error occurs when this trapping ability is disabled, the Interpreter will terminate
the current user program while showing the error message.
Event (of Keystroke) Trapping
Event (of Keystroke) TrappingEvent (of Keystroke) Trapping
Event (of Keystroke) Trapping
Traps a particular keystroke (caused by pressing any of the specified function keys) and
handles it by interrupt to transfer control to the event-handling routine.
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