* {{Parameter|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.
* [[RETURN]] returns to the next code statement after the [[ON...GOSUB]] statement. [[END]] or [[SYSTEM]] can be used to end program.
* '''Note:''' [[SELECT CASE]] provides a much more convenient way of doing this task.
==QBasic/QuickBASIC==
* In QuickBASIC 4.5 the list could contain a maximum of 60 line numbers or labels, while '''QB64''' has no limit.
{{PageExamples}}
''Example:''
{{CodeStart}}
{{Cl|CLS}}
a = 2
''ON'' a '''GOSUB''' hello, hereweare, 143
{{Cl|PRINT}} "Also notice the RETURN statement that can be used with GOSUB!"
{{Cl|END}}
hello:
{{Cl|PRINT}} "Hello, with a = 1 you get to see this!"
{{Cl|END}}
hereweare:
{{Cl|PRINT}} "with a = 2 here we are...return to line after ON."
{{Cl|RETURN}}
143
{{Cl|PRINT}} "Line 143, with a = 3 you get to see this!"
{{Cl|END}}
{{CodeEnd}}
{{OutputStart}}
with a = 2 here we are...return to line after ON.
Also notice the RETURN statement that can be used with GOSUB!
{{OutputEnd}}
:''Explanation:'' Since ''a'' equals to 2 it goes to the second item in the list (''hereweare'') and branches the program to there. Try changing 'a' to 1 or 3.