IF <condition> [<assembly language statements>] [ELSE] [<assembly language statements>] ENDIF
ELSEC
If <condition> is true, the statements between IF and the corresponding ELSE directive are assembled (generate code).
If <condition> is false, the statements between ELSE and the corresponding ENDIF directive are assembled. Nesting of conditional blocks is allowed. The maximum level of nesting is limited by the available memory at assembly time.
The following listing is an example of the use of conditional assembly directives:
Try: EQU 1 IF Try != 0 LDA #103 ELSE LDA #0 ENDIF
The value of Try determines the instruction to be assembled in the program. As shown, the lda #103 instruction is assembled. Changing the operand of the EQU directive to 0 causes the lda #0 instruction to be assembled instead.
Abs. Rel. Loc Obj. code Source line ---- ---- ------ --------- ------------------ 1 1 0000 0001 Try: EQU 1 2 2 0000 0001 IF Try != 0 3 3 000000 A667 LDA #103 4 4 ELSE 6 6 ENDIF