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35 lines
1.5 KiB
Plaintext
35 lines
1.5 KiB
Plaintext
[[$LET]] is a precompiler command, which is now usable by modern day [[cavemen]] to help include and exclude which sections of code compiles in their program based on OS/bit-size or other predefined conditions.
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{{PageSyntax}}
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: [[$LET]] variable = expression
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{{PageDescription}}
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* Unlike [[LET]], [[$LET]] is not optional.
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* $LET A = 12 sets a precompiler variable "a" to the value of 12. This variable is only valid for the precompiler itself and does nothing to affect the values of any variable/constant which might also be called "a" in the program.
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* Variable names must follow QB64's variable naming conventions.
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* You can check a precompiler variable against special values '''DEFINED''' and '''UNDEFINED''', in order to assess whether the variable has already been assigned a value. Useful for code in libraries which may be repeated.
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* The precompiler comes with some preset values which can be used to help determine which code blocks to include/exclude. These are:
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** '''WIN''' or '''WINDOWS''' if the user is running QB64 in a Windows environment.
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** '''LINUX''' if the user is running QB64 in a Linux environment.
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** '''MAC''' or '''MACOSX''' if the user is running QB64 in a macOS environment.
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** '''32BIT''' if the user is running a 32-bit version of QB64.
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** '''64BIT''' if the user is running a 64-bit version of QB64.
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** '''VERSION''', which is set to the version of the QB64 compiler.
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{{PageExamples}}
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* See example 1 in [[$IF]].
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{{PageSeeAlso}}
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* [[$IF]]
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* [[$ELSE]]
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* [[$ELSEIF]]
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* [[$END IF]]
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* [[Cavemen]]
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{{PageNavigation}}
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