Expressions and Statements

An expression is a combination of constants or variables that is used to denote computations.
For instance,
(5 + 3) * 10
is an expression that adds 5 and 3 first, and then multiplies the sum by 10.
In the C language, a statement is a complete instruction, ended with a semicolon. In many cases, you can turn an
expression into a statement by simply adding a semicolon at the end of the expression.
A null statement is represented by an isolated semicolon.
A group of statements can form a statement block that starts with an opening brace ({) and ends with a closing brace
(}). The C compiler treats a statement block as a single statement.