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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 AppendixEXIT Function
The EXIT MPL function terminates expansion of the most recently called REPEAT, WHILE, or user-defined MPL function. It is most commonly used to avoid infinite loops like those found when a WHILE expression is never FALSE or a when a user-defined macro never terminates. Moreover, it enables several exit points from the same macro.
The syntax for EXIT is:
%EXIT
Source Text
%SET (count, 0) %WHILE (1) (%IF (%count GT 5) THEN (%EXIT) FI DW %count, -%count %SET (count, %count + 1))
Output Text
DW 0, -0 DW 1, -1 DW 2, -2 DW 3, -3 DW 4, -4 DW 5, -5
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