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 computers 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`

.