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41 lines
1.4 KiB
Plaintext
41 lines
1.4 KiB
Plaintext
{{DISPLAYTITLE:OPTION _EXPLICITARRAY}}
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[[OPTION _EXPLICITARRAY]] instructs the compiler to require arrays be declared with [[DIM]], [[REDIM]] or equivalent.
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{{PageSyntax}}
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: [[OPTION _EXPLICITARRAY]]
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{{PageDescription}}
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* 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.
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* Unlike [[OPTION _EXPLICIT]], simple variables can still be used without a declaration. Example: {{InlineCode}}i = 1{{InlineCodeEnd}}
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{{PageErrors}}
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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 [[$NOPREFIX]] or comment lines started with an [[Apostrophe|apostrophe]] or [[REM]]).
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* Do not use [[OPTION _EXPLICITARRAY]] in [[$INCLUDE]]d modules.
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{{PageExamples}}
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''Example:'' Avoiding simple typos with [[OPTION _EXPLICITARRAY]] results shown in the QB64 IDE Status area.
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{{CodeStart}}{{Cl|OPTION _EXPLICITARRAY}}
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x = 1 'This is fine, it's not an array so not affected
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{{Cl|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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{{CodeEnd}}
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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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{{PageSeeAlso}}
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* [[OPTION _EXPLICIT]]
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* [[DIM]], [[REDIM]]
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* [[SHARED]]
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* [[STATIC]]
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{{PageNavigation}}
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