QBasic 1.1: TIMER Statement

Explanation

TIMER, ON TIMER Statements

TIMER enables, disables, or suspends timer event trapping. If event trapping is enabled, ON TIMER branches to a subroutine whenever a specified number of seconds has elapsed.

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Syntax

TIMER ON

TIMER OFF

TIMER STOP

ON TIMER(n%) GOSUB line

Description / Parameter(s)

TIMER ON	Enables timer event trapping.
TIMER OFF	Disables timer event trapping.
TIMER STOP	Suspends timer event trapping. Events are processed once event trapping is enabled by TIMER ON.
n%	The number of seconds that elapse before ON TIMER branches to the event-trapping subroutine; a value in the range 1 through 86,400 (24 hours).
line	The label or number of the first line of the event-trapping subroutine.

Example


ON TIMER(1) GOSUB TimeUpdate
TIMER ON
CLS
PRINT "Time: "; TIME$
StartTime = TIMER
WHILE TimePast < 10
  TimePast = TIMER - StartTime
WEND
END

TimeUpdate:
  LOCATE 1, 7: PRINT TIME$
  RETURN