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LEN returns the number of characters in a string constant or string
expression, or the number of bytes required by a variable.
 
LEN(stringexpression$)
  or
LEN(variable)
 
Usage Notes
    ■ The first syntax returns the number of characters in stringexpression$.
    ■ The second syntax returns the number of bytes required by a
      BASIC variable. This syntax is particularly useful for determining
      the correct record size of a random-access file.