Flonums
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A "flonum" represents a floating point number. The translation is
indirect: a decimal floating point number from the text is converted by
`as' to a generic binary floating point number of more than sufficient
precision. This generic floating point number is converted to a
particular computer's floating point format (or formats) by a portion
of `as' specialized to that computer.
A flonum is written by writing (in order)
* The digit `0'. (`0' is optional on the HPPA.)
* A letter, to tell `as' the rest of the number is a flonum. `e' is
recommended. Case is not important.
On the H8/300, H8/500, Hitachi SH, and AMD 29K architectures, the
letter must be one of the letters `DFPRSX' (in upper or lower
case).
On the ARC, the letter must be one of the letters `DFRS' (in upper
or lower case).
On the Intel 960 architecture, the letter must be one of the
letters `DFT' (in upper or lower case).
On the HPPA architecture, the letter must be `E' (upper case only).
* An optional sign: either `+' or `-'.
* An optional "integer part": zero or more decimal digits.
* An optional "fractional part": `.' followed by zero or more
decimal digits.
* An optional exponent, consisting of:
* An `E' or `e'.
* Optional sign: either `+' or `-'.
* One or more decimal digits.
At least one of the integer part or the fractional part must be
present. The floating point number has the usual base-10 value.
`as' does all processing using integers. Flonums are computed
independently of any floating point hardware in the computer running
`as'.