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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
'''ON...GOSUB''' is a control-flow statement that branches to a line or label in a list depending on a numerical expression.
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{{PageSyntax}}
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:: '''ON''' ''numerical-expression'' '''GOSUB''' ''lineornumber[,lineornumber][,...]''
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* The ''numerical-expression represents'' the ''line'' or ''label'' that it should branch to, 1 branches to the first line or label, 2 branches to the second, etc.
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* In QB 4.5 the list can contain a maximum of 60 line numbers or labels, while QB64 has no limit.
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* The procedure must be used after the number value is determined or in a loop to monitor current user events.
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* [[RETURN]] returns to the next code statement after the ON...GOSUB statement. [[END]] or [[SYSTEM]] can be used to end program.
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* '''Note:''' [[SELECT CASE]] provides a much more convenient way of doing this task.
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''Example:''
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{{CodeStart}} '' ''
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{{Cl|CLS}}
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a = 2
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''ON'' a '''GOSUB''' hello, hereweare, 143
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{{Cl|PRINT}} "Also notice the RETURN statement that can be used with GOSUB!"
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{{Cl|END}}
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hello:
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{{Cl|PRINT}} "Hello, with a = 1 you get to see this!"
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{{Cl|END}}
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hereweare:
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{{Cl|PRINT}} "with a = 2 here we are...return to line after ON."
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{{Cl|RETURN}}
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143
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{{Cl|PRINT}} "Line 143, with a = 3 you get to see this!"
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{OutputStart}}
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with a = 2 here we are...return to line after ON.
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Also notice the RETURN statement that can be used with GOSUB!
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{{OutputEnd}}
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:''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!
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''See also:''
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* [[ON...GOTO]]
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* [[GOSUB]], [[GOTO]]
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* [[SELECT CASE]], [[RETURN]]
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{{PageNavigation}} |