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1.2 KiB
1.2 KiB
ON...GOTO is a control-flow statement that branches to a line or label in a list depending on a numerical expression.
Syntax
ON numericalExpression GOTO labelOrNumber[,labelOrNumber][,...]
Description
- numericalExpression represents the line or label that the program should branch to: 1 branches to the first line or label in the list, 2 branches to the second, etc.
- The procedure must be used after the number value is determined or in a loop to monitor current user events.
- Note: SELECT CASE provides a much more convenient way of doing this task.
QBasic
- In QuickBASIC 4.5 the list could contain a maximum of 60 line numbers or labels, while QB64 has no limit.
Example(s)
Changing the program flow when a value is not 0.
CLS
a = 2
ON a GOTO hello, hereweare, 143
END
hello:
PRINT "you don't get to see this!"
END
hereweare:
PRINT "And here we are..."
END
143
PRINT "you don't get to see this neither..."
END
And here we are...
Explanation: Since a equals 2 it goes to the second item in the list (hereweare) and branches to there. Try changing *a' to 1 or 3.