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procedure TForm1.FormCreate（Sender: TObject）;varstr: string;n1, n2, n3: Integer;beginstr := "ABC";n1 := Low（string）; // 1n2 := Low（str）;// 1n3 := High（str）; // 3//  ShowMessageFmt（"%d, %d, %d", [n1, n2, n3]）;end;