private void CalButton_Click(object sender, EventArgs e)
{
switch (sym)
{
case "+": ResultText.Text = $"{num_1 + num_2}"; break;
case "-": ResultText.Text = $"{num_1 - num_2}"; break;
case "*": ResultText.Text = $"{num_1 * num_2}"; break;
case "/":
{
if (num_2 != 0)
{
ResultText.Text = $"{num_1 / num_2}"; break;
}
else
{
MessageBox.Show("除0错误");
Num2Text.Focus();
return;
}
}
}
}
private void Num2Text_TextChanged(object sender, EventArgs e)
{
if (Num2Text.Text.ToString() == "")
{
num_2 = 1;
}
else if (int.TryParse(Num2Text.Text.ToString(), out num_2))
{
num_2 = int.Parse(Num2Text.Text.ToString());
}
else
{
MessageBox.Show("输入有误");
Num2Text.Focus();
return;
}
}