private void btnMultiply_Click(object sender, EventArgs e)
{
PhepTinh cal = new PhepTinh();
try
{
cal.NumberA = Convert.ToDouble(txtNumberA.Text);
cal.NumberB = Convert.ToDouble(txtNumberB.Text);
}
catch (Exception)
{
if (txtNumberA.Text == "")
{
MessageBox.Show("Input A to calculate.");
txtNumberA.Focus();
}
else if (txtNumberB.Text == "")
{
MessageBox.Show("Input B to calculate.");
txtNumberB.Focus();
}
}
double result = cal.PhepNhan();
lblOperator.Text = "*";
txtResultNumA.Text = txtNumberA.Text;
txtResultNumB.Text = txtNumberB.Text;
txtResult.Text = result.ToString();
cal = null;
}
private void btnMinus_Click(object sender, EventArgs e)
{
PhepTinh cal = new PhepTinh();
try
{
cal.NumberA = Convert.ToDouble(txtNumberA.Text);
cal.NumberB = Convert.ToDouble(txtNumberB.Text);
}
catch (Exception)
{
if (txtNumberA.Text == "")
{
MessageBox.Show("Input A to calculate.");
txtNumberA.Focus();
}
else if (txtNumberB.Text == "")
{
MessageBox.Show("Input B to calculate.");
txtNumberB.Focus();
}
}
double result = cal.PhepTru();
lblOperator.Text = "-";
txtResultNumA.Text = txtNumberA.Text;
txtResultNumB.Text = txtNumberB.Text;
txtResult.Text = result.ToString();
cal = null;
}
