as: Flonums
3.6.2.3 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 and Renesas / SuperH SH 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 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'.
Info Catalog
as: Bignums
as: Numbers