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Conditional directives may be used to assemble certain statements
and exclude others. They may be used anywhere in the assembly
program, but are most often used inside macros.
The general syntax of conditional assembly directives is Conditional Tstatements [ELSE Fstatements] ENDIF Each conditional assembly directive ends with an ENDIF and there can be an optional ELSE clause present. If Conditional evaluates to true, the Tstatments are assembled, otherwise Fstatements are assembled if the ELSE clause is present. The next table gives the forms of the most useful conditional directives and what is required for them to be evaluated as true.
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