There are various types of expressions which can be categorised as follows:

a) Arithmetic expressions   -  expressions that are use arithmetic operators.

b) Logical expressions  - expressions that evaluate to true ("1") or false ("0").

c) Assignment expressions - expression that assign a value to a variable.

d) Constant expressions - expressions that have a contant value.

e) Function expressions - function calls as expressions.

These are described in more detail in the following sections.