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Ax51 User's Guide
Ax51 Introduction Assembling Programs Writing Assembly Programs 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 C Preprocessor Exceptions Side-Effects Predefined Macros Examples Error Messages AppendixStandard Macro Operators
Several operators are available that may be used in standard macros.
| Operator | Description |
|---|---|
| NUL | The NUL operator is used to determine if a macro argument is NULL. |
| & | The ampersand operator is used to concatenate text and parameters. |
| <> | Angle bracket operators are used to literalize delimiters like commas and blanks. |
| % | The percent operator is used to denote a macro parameter that is interpreted as an expression. |
| ;; | A double semicolon operator indicates that subsequent text on the line should be ignored. |
| ! | The exclamation mark operator is used to denote a literal character. |
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