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42 lines
1.2 KiB
Markdown
42 lines
1.2 KiB
Markdown
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[OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY) instructs the compiler to require arrays be declared with [DIM](DIM), [REDIM](REDIM) or equivalent.
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## Syntax
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> [OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY)
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## Description
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* Normally statements like `x(2) = 3` will implicitly create an array x(). [OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY) requires a preceding declaration for the array, helping to catch mistyped array and function names.
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* Unlike [OPTION _EXPLICIT](OPTION--EXPLICIT), simple variables can still be used without a declaration. Example: `i = 1`
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## Error(s)
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* It's not advisable to use [OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY) in [$INCLUDE]($INCLUDE)d modules.
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## Example(s)
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Avoiding simple typos with [OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY) results shown in the QB64 IDE Status area.
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```vb
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OPTION _EXPLICITARRAY
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x = 1 'This is fine, it's not an array so not affected
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DIM z(5)
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z(2) = 3 'All good here, we've explicitly DIMmed our array
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y(2) = 3 'This now generates an error
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```
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*QB64 IDE Status will show:*
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**Array 'y' (SINGLE) not defined on line 7**
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## See Also
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* [OPTION _EXPLICIT](OPTION--EXPLICIT)
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* [DIM](DIM), [REDIM](REDIM)
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* [SHARED](SHARED)
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* [STATIC](STATIC)
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