public static DATHUC KhoiTao(String Chuoi)
{
DATHUC kq;
kq.DonThuc = null;
kq.Ten = "";
kq.BienSo = "";
if (KiemTra(Chuoi))
{
String[] T = Chuoi.Split(new String[] { "=" },
StringSplitOptions.None);
String[] N = T[0].Split(new String[] { "(", ")" },
StringSplitOptions.None);
kq.Ten = N[0].Trim();
kq.BienSo = N[1].Trim();
XuLyDonThuc.Set_ChuoiPhanCach(kq.BienSo);
String[] M = T[1].Split(new String[] { ChuoiPhanCach },
StringSplitOptions.None);
kq.DonThuc = new DONTHUC[M.Length];
for (int i = 0; i < M.Length; i++)
{
kq.DonThuc[i] = XuLyDonThuc.KhoiTao(M[i]);
}
}
return(kq);
}
public static Double TinhGiaTri(DATHUC P, Double x0)
{
Double kq = 0;
foreach (DONTHUC q in P.DonThuc)
{
kq = kq + XuLyDonThuc.TinhGiaTri(q, x0);
}
return(kq);
}
public static String XuatChuoi(DATHUC P)
{
String kq = P.Ten + "(" + P.BienSo + ") = ";
int i = 0;
foreach (DONTHUC q in P.DonThuc)
{
kq = kq + XuLyDonThuc.XuatChuoi(q);
if (i < P.DonThuc.GetLength(0) - 1)
{
kq = kq + " + ";
}
i++;
}
return(kq);
}
static void Main()
{
if (XuLyTapTin.KiemTra("DonThuc.inp") == true)
{
DonThuc P;
Double x0;
Double kq;
P = XuLyDonThuc.Doc("DonThuc.inp");
String Chuoi;
Chuoi = "Tinh gia tri cua don thuc P(x)=";
Chuoi = Chuoi + XuLyDonThuc.XuatChuoi(P) + "\n";
XuLyChuoi.Xuat(Chuoi);
do
{
x0 = XuLySoThuc.Nhap("Nhap gia tri x0: ");
kq = XuLyDonThuc.TinhGiaTri(P, x0);
Chuoi = "Gia tri cua don thuc ";
Chuoi = Chuoi + XuLyDonThuc.XuatChuoi(P);
Chuoi = Chuoi + " la:" + XuLySoThuc.XuatChuoi(kq);
XuLyChuoi.Xuat(Chuoi);
} while (XuLySoNguyen.Nhap("\n Tiep tuc (0. Dung, 1.Tiep tuc):", 0, 1) != 0);
}
}
public static Boolean KiemTra(String Chuoi)
{
Boolean flag = true;
String[] T = Chuoi.Split(new String[] { "=" },
StringSplitOptions.None);
T[0] = T[0].Trim();
String[] N = T[0].Split(new String[] { "(", ")" },
StringSplitOptions.None);
flag = N.Length == 3;
if (flag)
{
XuLyDonThuc.Set_ChuoiPhanCach(N[1]);
String[] M = T[1].Split(new String[] { ChuoiPhanCach },
StringSplitOptions.None);
for (int i = 0; i < M.Length; i++)
{
flag = flag && XuLyDonThuc.KiemTra(M[i]);
}
}
return(flag);
}
