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'This example uses a recursive FUNCTION procedure (a function that calls
'itself) to find and return the length of a string.
 
DECLARE FUNCTION StrgLng% (X$)
CLS
INPUT "Enter a string: "; InString$
PRINT "The string length is"; StrgLng%(InString$)
 
FUNCTION StrgLng% (X$)
   IF X$ = "" THEN
      'The length of a null string is zero.
      StrLng% = 0
   ELSE
      'Non-null string--make a recursive call.
      'The length of a non-null string is 1 plus
      'the length of the rest of the string.
      StrgLng% = 1 + StrgLng%(MID$(X$, 2))
   END IF
END FUNCTION