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Back to data types.

Range of values: True .. False

Memory requirement: 4 bytes or 32 bits

A data field of the LongBool data type can only contain truth values.

Assigning other values ​​leads to compiler error messages when the program is compiled and the compilation process is aborted. This means that the executable program is not created.

The LongBool data type is used like the Boolean data type and behaves like the Boolean data type.

Declaration of a data field of type LongBool:

   l : LongBool;

Examples of assigning valid values:

  l := true;
  l := false;
  l := 10 <> 20 ;  // The result of the comparison is true

Examples of assigning invalid values:

  l := 'True';
  l := 'False';
  l := '10 <> 20';
  l := 24;

The difference between the two examples is that the upper example is the assignment of literals of the type Truth value, while the assignment of the lower example is literals of the type String and the type ShortInt.