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  QuickBASIC's data representations resemble those used in interpreted
  BASIC. QuickBASIC supports interpreted BASIC's 2-byte integers and an
  additional 4-byte LONG data type that is represented by a variable name
  with a terminal ampersand (for example, X&). Floating-point values are the
  same size as in interpreted BASIC (4 bytes for single-precision; 8 bytes
  for double-precision), but the floating-point representation follows the
  8087-compatible, IEEE standard instead of the unique representation used
  in interpreted BASIC.

  Like interpreted BASIC, QuickBASIC dynamically allocates memory for
  strings, so strings are represented by a two-part string descriptor.
  QuickBASIC's string descriptor is 4 bytes in size compared to 3 bytes in
  interpreted BASIC. Because the string length is represented in 2 bytes
  instead of 1, the maximum length of a QuickBASIC string is 65,535 bytes.