ABS - absolute value.
Usage:
plus := abs(value);
Where:
    - value 
 
    - is an expression whose type is either "real" or
        "integer". 
 
    - plus 
 
    - is the absolute value of "value". This has the
        same type as "value". 
 
Description:
The "abs" function determines the absolute value of
an integer or floating point number.
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