} // Chuyen noi dung XML thanh Nghiem
public static Nghiem XMLtoNghiem(String xmlDoc)
{
Nghiem kq;
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlDoc);
XmlElement root = doc.DocumentElement;
switch (root.Name)
{
case "NGHIEMBAC2":
kq = new NghiemBac2();
break;
case "NGHIEMBAC1":
kq = new NghiemBac1();
break;
default:
kq = null;
break;
}
kq.GetXMLDocument(xmlDoc);
return(kq);
}
public override Nghiem GiaiPT()
{
Nghiem kq;
if (A == 0)
{
NhiThuc nt = new NhiThuc(B, C);
kq = nt.GiaiPT();
}
else
{
kq = new NghiemBac2();
float delta = m_B * m_B - 4 * m_A * m_C;
if (delta > 0)
{
float temp = (float)Math.Sqrt((double)delta);
kq.Add((-m_B + temp) / (2 * m_A));
kq.Add((-m_B - temp) / (2 * m_A));
}
else
if (delta == 0)
{
kq.Add(-m_B / (2 * m_A));
}
}
return(kq);
}