public static CAUHOI KhoiTao(BIEUTHUC P, Random t)
{
CAUHOI kq;
kq.NoiDung = XuLyBieuThuc.XuatChuoi(P);
kq.TraLoi = new TRALOI[n_traloi];
for (int i = 0; i < n_traloi; i++)
{
kq.TraLoi[i] = XuLyTraLoi.KhoiTao(P, t);
}
kq.TraLoi[t.Next() % n_traloi].NoiDung = XuLyBieuThuc.TinhToan(P).ToString();
return(kq);
}
public static String XuatChuoi(CAUHOI P)
{
String kq = P.NoiDung + " = \r\n";
for (int i = 0; i < n_traloi; i++)
{
kq = kq + "(" + (i + 1) + ") " + XuLyTraLoi.XuatChuoi(P.TraLoi[i]);
if (i < n_traloi - 1)
{
kq = kq + "\t\t";
}
}
return(kq);
}
public static Boolean KiemTra(String Chuoi)
{
Boolean flag = true;
String[] M = Chuoi.Split(new String[] { ChuoiPhanCach },
StringSplitOptions.None);
flag = (M.Length > 0) && (M.Length % 2 == 0);
String S;
for (int i = 0, j = 0; flag && i < M.Length; i += 2, j++)
{
flag = XuLyTraLoi.KiemTra(M[i + 1]);
}
return(flag);
}
public static CAUHOI[] KhoiTao(String Chuoi)
{
CAUHOI[] kq;
kq = null;
if (KiemTra(Chuoi))
{
String[] M = Chuoi.Split(new String[] { ChuoiPhanCach },
StringSplitOptions.None);
kq = new CAUHOI[M.Length / 2];
String S;
for (int i = 0, j = 0; i < M.Length; i += 2, j++)
{
S = M[i].Replace("=", "");
kq[j].NoiDung = S.Trim();
kq[j].TraLoi = XuLyTraLoi.KhoiTao(M[i + 1]);
}
}
return(kq);
}
