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Integer expressions

Integer expression is a particular case of a numeric expression that returns a whole number.

Literal integer	a base-10 representation of an whole number
Function	a function which returns exactly one value
Named value	one of these values: a variable of the INTEGER or compatible data type the constant TRUE, FALSE, or (in some contexts) NULL a simple member of a record or an simple element of an array
Boolean expression	an expression which returns either TRUE or FALSE

Any function calls or named values must return INTEGER values.

Values of the DATE data type can be used in integer expressions only when they define the difference between two DATE values (because this difference is returned in the integer format). This difference can be converted to the INTERVAL data type use UNITS operator.

Integer expressions can be used as operands within any other 4gl expression.