The XDR Representation of some simple types

Integers:

Signed: Two's Complement (MSB is a sign bit).
Unsigned: As above, but all 32 bits store the value.
Short Integers: Stored as though the short had been assigned to a long.

Reals - Single Precision:

Reals - Double Precision:

S - Sign Bit (0 -> positive)
E - Exponent
M - Mantissa