RETURN: Return from a Procedure Subroutine

This command tells VISTA that the execution of the current sub-procedure is complete and to return to any calling procedure or to immediate input mode as is appropriate. This command is intended to allow a return from the procedure as a result of an IF test. In cases where no condition testing is needed, the final END command in the procedure buffer will tell VISTA that the procedure has completed.

Examples:

1. Here is an example of a conditional exit from a procedure. This procedure may be run with CALL or GO.

        LOOP:
           ASK 'Enter non-zero to process another image >> ' TEST
           IF TEST=0
              RETURN
           END_IF
            :
            :
        GOTO LOOP:
   

2. END may be used as return ONLY if it is the last command in the file. Thus a procedure like:

        (commands)
        END
   

   may be executed as a subroutine, but one that looks like:

        IF TEST=0
           END
        END_IF
   

   will not work. Use RETURN instead.