Packed decimal (P) format floating literals are not supported. Feel free to add the code!
The floating point formats generated by directives are these.
.float
Single precision floating point constants.
.double
Double precision floating point constants.
.extend
.ldouble
Extended precision (long double) floating point constants.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.