Rockwell Automation 1746-BAS BASIC LANGUAGE - Manual (Page 252)

Publication 1746-RM001A-US-P
15-10 String Functions
CALL 68 – Find the
Length of a String Purpose
Use CALL 68 to determine the length of a string. One input argument is expected.
This is the string number on which the routine acts. One output argument is
required. It is the actual number of non-carriage return (CR) characters in this
string. This is similar to the BASIC command LEN(str$) (example:
L=LEN($l)
).
The length of the string can be properly determined only if the string is terminated
with a CR character. If a string is filled using the ASC instruction, a CR must be
added as the last character to terminate the string.
Syntax
PUSH [string number]
CALL 68
POP [number of characters]
Example
>1 REM EXAMPLE PROGRAM
>10 REM SAMPLE OF STRING LENGTH
>20 STRING 1 0,10
>30 $(1) = “1234567”
>40 PUSH 1 : REM BASE STRING
>50 CALL 68 : REM INVOKE STRING LENGTH ROUTINE
>60 POP L : REM GET LENGTH OF BASE STRING
>70 PRINT “THE LENGTH OF ”,$(1),“ IS”,L
>80 END
READY
>RUN
THE LENGTH OF 1234567 IS 7
READY
>