//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 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()));
}
