Chapter 4-2: True/False Status Indicators

An Example of T/F Usage

Consider the following series of statements as an example of how T/F status indicators are set and T/F execution conditions are evaluated.
 

Level 1 will be T if --- OPTION is equal to USER 1, if level 1 is F then the remaining code (shown) will not be executed.

Level 2 will be T if the specified record is successfully read and Level 1 is T.

Level 3 will be T if the quantity on hand is greater than the quantity requested and Levels 1 and 2 are T..

Level 4 will be T if the REWRITE of the updated record is successful and Levels 1, 2, and 3 are T.

Level 5 will be T if the WRITE of the receipt record is successful and Levels 1, 2, 3, and 4 are T.

As you see the T/F indicators cascade downward to include any furtther ILF statements as required for your particualar requirements.

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