REM Floating-point literal syntax:
      REM  [-]{digit}[.]{digit}[E[-]{digit}]

      REM Examples:
      PRINT -123.456E-1
      PRINT 1000.0
      PRINT 1E-5

      REM Valid but non-standard examples:
      PRINT 67.
      PRINT 8.9E
      PRINT .33E-
      PRINT -.