计算器制作Button btn = (Button)sender;
if (f == 1)
{
str1 = str1 + btn.Text.Trim ();
Label1.Text = str1;
}
else
{
str2 = str2 + btn.Text .Trim ();;
Label1.Text = str1 + opr + str2;
}
}
protected void Button_opr_Click(object sender, EventArgs e)
{ Button btn = (Button)sender;
if (f == 1)
{
opr = btn.Text;
f = 2;
}
Label1.Text = str1+opr;
}