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An expression is a mathematical, string, or logical formula that produces a value. An expression may be the source variable of an assignment statement, a parameter of a procedure, a subscript of an array (a dimensioned variable), or the condition of an IF, CASE, LOOP, or EXECUTE structure. Expressions may contain constant values, variables, and procedures which return values, all connected by logical and/or arithmetic or string operators.

**Related Topic:** [[expression evaluation.htm|Expression Evaluation]]