Introspection: Difference between revisions
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PowerBASIC has no way of determining if a variable "exists" in code. If variable declaration is required (using <code>#DIM ALL</code>), then any attempt to use a variable without declaring it will result in a failed compile; if variable declaration is ''not'' required, then the first time the program accesses the variable it is automatically created with the default data type (which is set using <code>DEFtype</code>).
The compiler directive <code>#COMPILER</code>, introduced with PB/Win 8 and PB/CC <!--uncertain version here--> 4, will fail the compile if the compiler does not match at least one of the listed
<lang powerbasic>#COMPILER PBWIN 9
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