End of string

13 Mar 2005

      How does writeln knows its the end of a string?
I have the following code:

String = packed array[1..256] of char;

var
       Test: String;

begin
       Test:='Hello world';
       writeln (Test);
       Test[8] := Test[12];
       writeln (Test);
end.

The output is:

Hello world

Hello w rld

How does writeln knows where to stop printing the
string?

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