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.

- An ‘

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`

.