Re: libpq: PQexecParams, binaryFormat and float - Mailing list pgsql-interfaces

"Sun, Way" <Way.Sun@sciatl.com> writes:
>     float    loadavg;
>     loadavg = htonl(1.23);

It seems entirely unlikely that that will produce a byte-reversed float
value; what I think will happen is that the byte-reversed value of
integer 1 will be converted into a host-format float and stored into
loadavg.

AFAIK you can't really do this in C without a union.  Take a look at 
pq_sendfloat4 and pq_getmsgfloat4 in the backend for examples.
        regards, tom lane