Skip leading space delimiters. Parse name delimited by a
space. Create a definition for name with the execution
semantics defined below. Reserve 1
FLOATS
address units of data space at a float-aligned address.
name is referred to as an "f-variable".
f-addr is the address of the data space reserved by FVARIABLE when it created name. A program is responsible for initializing the contents of the reserved space.