Sather - Language Specification Prev Chapter 6. A floating point literal is of type FLT unless suffixed by 'd' designating a FLTD literal. The optional ' e ' portion is used to specify a power of 10 by which to multiply the decimal value. Underscores may be used within floating point literals to improve readability and are ignored.
Literal values are only legal if they are within the range specified by the IEEE standard.