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x := integer(Edit1.Text);
  y := integer(Edit2.Text);
  z:= x+y;
  Label3.Caption := inttostr(z);


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  x:=strtoint(Edit1.Text);
  y:=strtoint(Edit2.Text);
  z:=x+y;
  Label3.Caption := inttostr(z);

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x:=strtoint(Edit1.Text);
  y:=strtoint(Edit2.Text);
  z:=x+y;
  Label3.Caption := inttostr(z);

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Delphi(Pascal) code:

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  x:=strtoint(Edit1.Text);
  y:=strtoint(Edit2.Text);
  z:=x+y;
  Label3.Caption := inttostr(z);
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x:=strtointdef(Edit1.Text,0);
y:=strtointdef(Edit2.Text,0);
z:=x+y;
Label3.Caption :=


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