public static TRALOI KhoiTao(BIEUTHUC P, Random t)
{
TRALOI kq;
kq.NoiDung = "";
long k = XuLyBieuThuc.TinhToan(P) + t.Next() % 100;
kq.NoiDung = k.ToString();
return(kq);
}
private static BIEUTHUC NhapCucBo(String GhiChu)
{
String Chuoi;
do
{
Chuoi = XuLyChuoi.Nhap(GhiChu);
} while (!KiemTra(Chuoi));
BIEUTHUC kq = KhoiTao(Chuoi);
return(kq);
}
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 BIEUTHUC[] Nhap(String GhiChu)
{
BIEUTHUC[] kq;
XuLyChuoi.Xuat(GhiChu);
long n;
n = XuLySoNguyen.Nhap("Ban muon tao bao nhieu cau hoi?", 1, 100);
kq = new BIEUTHUC[n];
for (int i = 0; i < n; i++)
{
kq[i] = NhapCucBo("Nhap bieu thuc thu " + (i + 1) + ":");
}
return(kq);
}
public static long TraLoiCauHoi(CAUHOI P)
{
Boolean flag = true;
BIEUTHUC Q = XuLyBieuThuc.KhoiTao(P.NoiDung);
long t = XuLyBieuThuc.TinhToan(Q);
for (int i = 0; i < P.TraLoi.Length; i++)
{
if (t == long.Parse(P.TraLoi[i].NoiDung))
{
return(i + 1);
}
}
return(-1);
}
public static long TinhToan(BIEUTHUC P)
{
long kq = 0;
switch (P.PhepToan)
{
case PHEPTOAN.CONG:
kq = P.So1 + P.So2;
break;
case PHEPTOAN.TRU:
kq = P.So1 - P.So2;
break;
case PHEPTOAN.NHAN:
kq = P.So1 * P.So2;
break;
}
return(kq);
}
public static String XuatChuoi(BIEUTHUC P)
{
String kq;
kq = P.So1 + " _ " + P.So2;
switch (P.PhepToan)
{
case PHEPTOAN.CONG:
kq = kq.Replace("_", "+");
break;
case PHEPTOAN.TRU:
kq = kq.Replace("_", "-");
break;
case PHEPTOAN.NHAN:
kq = kq.Replace("_", "*");
break;
}
return(kq);
}