double res = 0; double num1 = Convert.ToDouble(txt1.Text); double num2 = Convert.ToDouble(txt2.Text); if (radioAdd.Checked ) res = num1 + num2; else if (radioSub.Checked == true) res = num1 - num2; else if (radioMul.Checked == true) res = num1 * num2; else res = num1 / num2; txtResult.Text += res.ToString();
txtResult.Text = string.Format("{0:d}",res);
var
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