Logical data types can be specified as follows:
If a kind parameter is specified, the logical constant has the kind specified. If no kind parameter is specified, the kind of the constant is default logical.
A logical constant represents only the logical values true or false, and takes one of the following forms:
Logical data type ranges correspond to their comparable integer data type ranges. For example, the LOGICAL(2) range is the same as the INTEGER(2) range.
For More Information:
For details on integer data type ranges, see your user manual or programmer's guide.