static void Main(string[] args)
{
Dathuc t1 = new Dathuc(2);
t1.nhap(); Console.WriteLine("cac he so dt 1"); t1.hien();
Dathuc t2 = new Dathuc(2);
t2.nhap(); Console.WriteLine("cac he so dt 2"); t2.hien();
Dathuc t3 = t1.tong(t2);
Dathuc t4 = t1.tong(t3);
if (t3 == null)
{
Console.WriteLine("2 dt khac bac");
}
else
{
Console.WriteLine("tong 2 dt");
}
t3.hien();
if (t4 == null)
{
Console.WriteLine("2 da thuc khac bac");
}
else
{
Console.WriteLine("hieu 2 dt");
}
t4.hien();
Console.ReadKey();
}
public Dathuc hieu(Dathuc t2)
{
if (this.bac == t2.bac)
{
Dathuc t = new Dathuc(this.bac);
for (int i = 0; i < bac; i++)
{
t.a[i] = this.a[i] - t2.a[i];
}
return(t);
}
else
{
return(null);
}
}
