# 2.3 Expressions

An expression is a scalar field reference, a function reference, or a combination of these references plus operators. Expressions represent singular values. Combinations represent singular values because they resolve into singular values when computations (specified by the operators) are performed on their data items.

Expressions are classified as arithmetic, character, relational, or logical. Arithmetic expressions produce numeric values, character expressions produce character values, and relational and logical expressions produce logical values.

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