+                        Addition, Set Union, and Concatenation      Operator

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  Addition

 <exp1> + <exp2>

    The + operator performs addition. The result depends upon the
    operands. If either is real, the result is real; otherwise, the result
    is integer.


   <exp1>,<exp2>    Any real or integer expression.

    Example:
           I := 3223 + 88;          { I = 3311 }
           X := 3.5 + 4.5;          { X = 8.0  }

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  Set Union

 <set1> + <set2>

    The + operator performs set union. The result is a set of the same
    base type as the operands, whose members are members of either <set1>
    or <set2>.

   <set1>,<set2>    Any set expression. Both expressions must be of the
                    same base type.

    Example:
           S := [1,2,5,6] + [2,4,6,8];      { S = [1,2,4,5,6,8] }

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  String Concatenation

 <str1> + <str2>

    The + operator performs concatenation on strings. The result is a
    string composed of <str1> followed by <str2>.

   <str1>,<str2>    Any string expression.

    Example:
           Name := 'Rufus ' + 'Jones';      { Name = 'Rufus Jones' }