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29 lines
1.4 KiB
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29 lines
1.4 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:12:23}}
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[[COMMON]] shares common variable values with other linked or [[CHAIN]]ed modules.
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{{PageSyntax}}
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: [[COMMON]] [SHARED] variableList
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{{PageLegacySupport}}
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* The multi-modular technique goes back to when '''QBasic''' and '''QuickBASIC''' had module size constraints. In '''QB64''' the [[COMMON]] statement has been implemented so that that older code can still be compiled, though it is advisable to use single modules for a single project (not counting [[$INCLUDE]] libraries), for ease of sharing and also because the module size constraints no longer exist.
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{{PageDescription}}
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* COMMON must be called before any executable statements.
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* [[SHARED]] makes the variables shared within [[SUB]] and [[FUNCTION]] procedures within that module.
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* variableList is the list of common variables made available separated by commas.
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* Remember to keep the variable type ''order'' the same in all modules, as the variables names don't matter.
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* [[COMMON SHARED]] is most commonly used to share the variables with subs and functions of that module.
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* '''Note: Values assigned to shared variables used as procedure call parameters will not be passed to other procedures. The shared variable value must be assigned inside of the [[SUB]] or [[FUNCTION]] procedure to be passed.'''
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{{PageSeeAlso}}
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* [[COMMON SHARED]], [[CHAIN]]
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* [[DIM]], [[REDIM]], [[SHARED]]
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* [[DEFSTR]], [[DEFLNG]], [[DEFINT]], [[DEFSNG]], [[DEFDBL]]
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{{PageNavigation}}
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