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41 lines
1.1 KiB
Markdown
41 lines
1.1 KiB
Markdown
[OPTION _EXPLICIT](OPTION--EXPLICIT) instructs the compiler to require variable declaration with [DIM](DIM), [REDIM](REDIM) or an equivalent statement.
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## Syntax
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> [OPTION _EXPLICIT](OPTION--EXPLICIT)
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## Description
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* With [OPTION _EXPLICIT](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](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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## Error(s)
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* It's not advisable to use [OPTION _EXPLICIT](OPTION--EXPLICIT) in [$INCLUDE]($INCLUDE)d modules.
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## Example(s)
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Avoiding simple typos with [OPTION _EXPLICIT](OPTION--EXPLICIT) results shown in the QB64 IDE Status area.
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```vb
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OPTION _EXPLICIT
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DIM myVariable AS INTEGER
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myVariable = 5
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PRINT myVariabe
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```
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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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## See Also
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* [OPTION _EXPLICITARRAY](OPTION--EXPLICITARRAY)
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* [DIM](DIM), [REDIM](REDIM)
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* [SHARED](SHARED)
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* [STATIC](STATIC)
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