END FOR loop
This command marks the end of the FOR..END FOR SuperBASIC structure with the same loop name, and has no real meaning on its own. When the interpreter meets this statement, it then looks at the stack to see if a related FOR command has already been parsed.
If not, then the error ‘Not Found’ will be reported, however, if such a FOR loop has been parsed, the interpreter will fetch the end parameter and if the loop is not yet at this value, then step is added to loop and control returned to the statement following FOR.
If however loop is already at the end value, control passes to the statement following END FOR.
The second variant is only available under SMS, where the interpreter presumes that if no loop name is specified, the programmer means the interpreter to return control to the most recent FOR statement (if the loop is not at its final value).
When an EXIT loop is found, the interpreter will search for the relative END FOR loop, and if found, will resume program flow at the next statement.
Under SMS, neither EXIT nor END FOR need have a loop identifier, and therefore EXIT will simply cause the program to jump to the statement after the next END FOR command (if no loop is specified).
This does however mean, that except under SMS, unless an in-line FOR structure is being used, if this command is missing, the interpreter will carry on searching through the program and may just stop without an error if END FOR loop does not appear anywhere in the program.
END FOR need not appear in an in-line FOR statement.
SMS will report ‘unable to find an open loop’ if the interpreter comes across an END FOR command (without a loop variable name) without a corresponding open FOR loop. If the interpreter comes across an END FOR command (with a loop variable name) without a corresponding open FOR loop the error ‘undefined loop control variable’ is reported.