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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 AppendixLEN Function
The LEN MPL function returns the length of a specified character string. The character string is limited to 256 characters in length. The syntax for the LEN function is:
%LEN (balanced-text)
Source Text
%LEN (Ax51) %' len = 4' %LEN (Ax51,Ax51) %' comma counts also' %LEN () %LEN (ABCDEFGHIJKLMNOPQRSTUVWXYZ) %DEFINE (TEXT) (QUEEN) %DEFINE (LENGTH) (%LEN (%TEXT)) LENGTH OF '%TEXT' = %LENGTH.
Output Text
4 9 0 26 LENGTH OF 'QUEEN' = 5.
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