C++ programs consist of statements, which in turn, consist of expressions.
(An expression is a specific combination of operators and operands, which evaluates to a particular result.

The operands can be variables, literals, or method calls that return a value.)

In your past experience, you may have referred to expressions by the names formulas or equations.

Although formulas and equations are not exactly the same thing as expressions, they are close enough to help you understand what expressions are and how they are used.