An expression represents a single value. It can be a single basic component, such as a constant, or a combination of basic components, such as variables and parameters, with one or more operators. Operators specify computations to be performed, using the values of the basic components to obtain a single value.
Expressions commonly appear on the righthand-side of assignment statements, and in argument lists to function calls. Most expressions are classified as being either numeric, logical (also known as relational), or string. Brackets may be used in any type of expression to group subexpressions in order to ensure the are evaluated in the intended order.
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