[[OPTION _EXPLICITARRAY]] instructs the compiler to require arrays be declared with [[DIM]], [[REDIM]] or equivalent.
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: [[OPTION _EXPLICITARRAY]]
{{PageDescription}}
* Normally statements like {{InlineCode}}x(2) = 3{{InlineCodeEnd}} will implicitly create an array x(). [[OPTION _EXPLICITARRAY]] requires a preceding declaration for the array, helping to catch mistyped array and function names.
* Unlike [[OPTION _EXPLICIT]], simple variables can still be used without a declaration. Example: {{InlineCode}}i = 1{{InlineCodeEnd}}
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* If used, [[OPTION _EXPLICITARRAY]] must be the very first statement in your program. No other statements can precede it (except for [[$NOPREFIX]] or comment lines started with an [[Apostrophe|apostrophe]] or [[REM]]).
* Do not use [[OPTION _EXPLICITARRAY]] in [[$INCLUDE]]d modules.
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''Example:'' Avoiding simple typos with [[OPTION _EXPLICITARRAY]] results shown in the QB64 IDE Status area.
{{CodeStart}}{{Cl|OPTION _EXPLICITARRAY}}
x = 1 'This is fine, it's not an array so not affected