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A166 User's Guide
A166 Introduction Assembling Programs Operands and Expressions Operators Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting A Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes Errors Error Messages Appendix;; Operator
The double-semicolon operator (';;') is used to signal that the remaining text on the line should not be output when the macro is expanded. This operator is typically used to precede comments that are not required in the macro expansion. For example:
REGCLR MACRO CNT
REGNUM SET 0
REPT CNT ;; rpt for CNT registers
MOV R®NUM, #0 ;; set R# to 0
REGNUM SET %(REGNUM+1)
ENDM
ENDM
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