{Getmxx.PAS}
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 {Sample code for the GetMaxX function.}

  uses Graph;

 var Gd, Gm: Integer;
 begin
   Gd := Detect;
   InitGraph(Gd, Gm, '');
   if GraphResult <> grOk then
     Halt(1);
   Rectangle(0, 0, GetMaxX, GetMaxY);   { Draw a full-screen box }
   Readln;
   CloseGraph;
 end.