FOR Statement

The FOR statement executes a limited number of iterations, using an integer index variable.
FOR Statement
Name
FOR ... TO ... BY ... DO ... END_FOR
Syntax
FOR <index> :
=
<mini> TO <maxi> BY <step> DO
<statement> ;
<statement> ;
END_FOR;
Operands
index:
 internal integer variable increased at each loop
mini:
 initial value for index (before first loop)
maxi:
 maximum allowed value for index
step:
 index increment at each loop
The [ BY step ] statement is optional. If not specified, the increment step is 1.
IMPORTANT: Because the virtual machine is a synchronous system, input variables are not refreshed during FOR iterations.
This is the "WHILE" equivalent of a FOR statement:
index := mini;

while (index <= maxi) do

    <statement> ;

    <statement> ;

    index := index + step;

end_while;
Example
(* ST program using FOR statement *)

(* this program extracts the digit characters of a string *)

length := mlen (message);

target := ''; (* empty string *)

FOR index := 1 TO length BY 1 DO

    code := ascii (message, index);

    IF (code >= 48) & (code <= 57) THEN

        target := target + char (code);

    END_IF;

END_FOR;
To insert a FOR statement
  • From the
    Toolbox
    , drag the
    FOR
     element into the language container.
Provide Feedback
Have questions or feedback about this documentation? Please submit your feedback here.
Normal