An expression is a series of operands and operators that you specify when you write a program or function script.
Each expression resolves to a particular type of value at run time. A numeric expression resolves to a number; a string expression resolves to a series of characters; and a logical expression resolves to true or false.
Related reference
Logical expressions
Numeric expressions
String expressions
(C) Copyright IBM Corporation 1992, 2005. All Rights Reserved.