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25 lines
1.5 KiB
Markdown
25 lines
1.5 KiB
Markdown
[COMMON](COMMON) shares common variable values with other linked or [CHAIN](CHAIN)ed modules.
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## Legacy Support
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* The multi-modular technique goes back to when QBasic and QuickBASIC had module size constraints. In QB64 [COMMON](COMMON) 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 [$INCLUDE]($INCLUDE) libraries), for ease of sharing and also because the module size constraints no longer exist.**
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## Syntax
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> [COMMON](COMMON) [SHARED] variableList
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## Description
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* COMMON must be called before any executable statements.
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* [SHARED](SHARED) makes the variables shared within [SUB](SUB) and [FUNCTION](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](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](SUB) or [FUNCTION](FUNCTION) procedure to be passed.**
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## See Also
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* [COMMON SHARED](COMMON-SHARED), [CHAIN](CHAIN)
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* [DIM](DIM), [REDIM](REDIM), [SHARED](SHARED)
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* [DEFSTR](DEFSTR), [DEFLNG](DEFLNG), [DEFINT](DEFINT), [DEFSNG](DEFSNG), [DEFDBL](DEFDBL)
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