2A. decimal (1)
Immediate values in E all evaluate to a 32bit result; the only
difference among these values (A-G) is either their internal
representation, or the fact that they return a pointer rather than
a value.

A decimal value is a sequence of characters "0" .. "9", possibly
preceded by a minus "-" sign to denote negative numbers.
examples: 1, 100, -12, 1024