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43 lines
1.3 KiB
Plaintext
43 lines
1.3 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 [[$NOPREFIX]] or comment lines started with an [[Apostrophe|apostrophe]] or [[REM]]).
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* Do not use [[OPTION _EXPLICIT]] in [[$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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''QB64 IDE Status will show:''
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'''Variable 'myVariabe' (SINGLE) not defined on line 4'''
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{{PageSeeAlso}}
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* [[OPTION _EXPLICITARRAY]]
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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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