LEN (string [,kind])

  Class:  Inquiry function - Generic

  Returns the number of characters in the argument.  The argument
  must be a character expression.

  The "kind" must be a scalar integer initialization expression.

  The result is an INTEGER*4 or INTEGER*8 value.  If "kind" is
  present, the kind parameter of the result is that specified by
  "kind"; otherwise, the kind parameter of the result is that of
  default integer.  If the processor cannot represent the result
  value in the kind of the result, the result is undefined.

  The setting of compiler options that specify integer size can
  affect the result of this function.