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String operators

There is only one string operator : +. It’s action is to concatenate the contents of the two strings (or characters) it stands between. One cannot use + to concatenate null-terminated (PChar) strings. The following are valid string operations: 
   'This is ' + 'VERY ' + 'easy !'
   Dirname+'\'
The following is not: 
 Var Dirname = Pchar;
 ...
   Dirname := Dirname+'\';
Because Dirname is a null-terminated string.

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