//so do dai ,gia tri cua tung phan tu trong mang
public int Compareto(SoLon b)
{
var ar = this.arr;
var br = b.arr;
if (ar.Length > br.Length)
{
return(1);
}
else if (ar.Length < br.Length)
{
return(-1);
}
else
{
for (int i = 0; i < ar.Length; i++)
{
if (ar[i] > br[i])
{
return(1);
}
if (ar[i] < br[i])
{
return(-1);
}
}
return(0);
}
}
//phep tru
static SoLon Tru(SoLon a, SoLon b)
{
if (b.ToString() == "0")
{
return(a);
}
else if (a.ToString() == "0")
{
return(b);
}
var max = Math.Max(a.arr.Length, b.arr.Length);
var mangLon = MakeSameLength(a.arr, max);
var mangNho = MakeSameLength(b.arr, max);
if (a.Compareto(b) == -1)
{
mangLon = b.arr;
mangNho = a.arr;
}
var ret = TruMang(mangLon, mangNho);
return(new SoLon(ret));
}
//phep gia thừa
public SoLon GiaiThua()
{
var a = this;
var ret = new SoLon("1");
while (!a.Equals(new SoLon("1")))
{
ret = ret * a;
a = a - new SoLon("1");
}
return(ret);
}
//phep mu
static SoLon Mu(SoLon a, SoLon mu)
{
var ret = new SoLon("1");
var donVi = new SoLon("1");
var dem = new SoLon("0");
while (!dem.Equals(mu))
{
ret = ret * a;
dem = dem + donVi;
}
return(ret);
}
//phep cong
static SoLon Cong(SoLon a, SoLon b)
{
if (a.ToString() == "0")
{
return(b);
}
if (b.ToString() == "0")
{
return(a);
}
var ret = CongMang(a.arr, b.arr);
return(new SoLon(ret));
}
// phep nhan
static SoLon Nhan(SoLon a, SoLon b)
{
var mangLon = a.arr;
var mangNho = KiemTraMangKhac0(b.arr);
if (a.Compareto(b) == -1)
{
mangLon = b.arr;
mangNho = KiemTraMangKhac0(a.arr);
}
var ret = new int[mangNho.Length];
for (int i = 0; i < mangNho.Length; i++)
{
var x = NhanSoVoiMang(mangNho[mangNho.Length - 1 - i], mangLon);
if (i > 0)
{
x = Them10DonViChoSo(x, i);
}
ret = CongMang(x, ret);
}
return(new SoLon(ret.ToArray()));
}