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72 lines
5 KiB
Plaintext
72 lines
5 KiB
Plaintext
{{DISPLAYTITLE:OPTION _EXPLICIT}}
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[[OPTION _EXPLICIT]] instructs the compiler to require variable declaration with [[DIM]], [[REDIM]] or an equivalent statement.
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{{PageSyntax}}
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: [[OPTION _EXPLICIT]]
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{{PageDescription}}
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* With [[OPTION _EXPLICIT]] you can avoid typos by having QB64 immediately warn in the '''Status area''' of new variables used without previous declaration.
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* Enable [[OPTION _EXPLICIT]] temporarily even if a program source file doesn't contain the directive by specifying the '''-e''' switch when compiling via command line (''qb64 -c file.bas -e'').
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{{PageErrors}}
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* If used, [[OPTION _EXPLICIT]] must be the very first statement in your program. No other statements can precede it (except for comment lines started with an [[Apostrophe|apostrophe]] or [[REM]]).
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* Do not use [[OPTION _EXPLICIT]] in [[$INCLUDE]]d modules.
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{{PageExamples}}
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''Example:'' Avoiding simple typos with [[OPTION _EXPLICIT]] results shown in the QB64 [[IDE]] Status area.
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{{CodeStart}}{{Cl|OPTION _EXPLICIT}}
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{{Cl|DIM}} myVariable {{Cl|AS}} {{Cl|INTEGER}}
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myVariable = 5
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{{Cl|PRINT}} myVariabe
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{{CodeEnd}}
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<center>QB64 IDE Status:</center>
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{{CodeStart}}{{text|██|blue}} '''QB64''' _ {{xbox| X }}{{CodeEnd}}
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{{TextStart}} '''File Edit View Search Run Options Help''' {{TextEnd}}
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{{CodeStart}}┌────────────────────────────────────█{{title|Untitled}}█─────────────────────────────────────────────┐
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│OPTION _EXPLICIT {{title|↑|black}}
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│ {{text|█|black}}
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│DIM myVariable AS INTEGER ▒
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│ ▒
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│myVariable = 5 ▒
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│ ▒
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│PRINT myVariabe_ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ ▒
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│ {{title|↓|black}}
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{{title|←|black}}{{text|█|black}}▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒{{title|→|black}}│
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────────────────────────────────────── Status ──────────────┤{{text|{{Cl|Quick Search Bar|Find[ }} {{Cl|Quick Search list|↕]}}|aqua}}├─┤
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│Variable 'myVariabe' (SINGLE) not defined on line 7 │
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│ {{title|↑|black}}
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│ ▒
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│ ▒
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│ {{title|↓|black}}
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{{CodeEnd}}
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{{BlueStart}} '''7:17'''{{BlueEnd}}
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{{PageSeeAlso}}
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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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