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EXIT Statement Programming Example
 
This subprogram is an extended RTRIM$ function that removes trailing
blanks, tabs, carriage returns, and line feeds from a string. The
subprogram begins looking at the end of the string and uses the EXIT
FOR statement to jump out of the loop when the first printing character is
found.
 
See the STATIC statement examples for an example of using the EXIT SUB
statement.
                                ----- Note -----
Do not try to run this subprogram without a main program.
                                ----------------
 
' Rtrim removes trailing blanks, tabs, carriage returns,
' and line feeds from a string.
SUB Rtrim(S$) STATIC
J=0
' Begin at the end of the string and find the first
' character that isn't a blank, tab, carriage return, or
' line feed.
FOR I = LEN(S$) TO 1 STEP -1
   C$ = MID$(S$,I,1)
   IF C$ <> " " AND C$ <> CHR$(9) AND C$ <> CHR$(10) AND C$ <> CHR$(13) THEN
      J=I
      EXIT FOR
   END IF
NEXT I
' Remove the unwanted trailing characters.
S$=LEFT$(S$,J)
END SUB