What are the Data types of the ABAP/4 layer?

Possible ABAP/4 data types:
C: Character.
D: Date, format YYYYMMDD.
F: Floating-point number in DOUBLE PRECISION (8 bytes).
I: Integer.
N: Numerical character string of arbitrary length.
P: Amount or counter field (packed; implementation depends on hardware
platform).
S: Time stamp YYYYMMDDHHMMSS.
T: Time of day HHMMSS.
V: Character string of variable length, length is given in the first
two bytes.
X: Hexadecimal (binary) storage.