static void Main3()
{
Console.WriteLine("Nhap thong tin da thuc thu 1");
DATHUC t1 = new DATHUC(4); t1.Nhap();
Console.WriteLine("Nhap thong tin da thuc thu 2");
DATHUC t2 = new DATHUC(4); t2.Nhap();
DATHUC t3 = t1.Tong(t2);
if (t3 == null)
{
Console.WriteLine("Hai da thuc co kich co khac nhau");
}
else
{
Console.WriteLine("Tong hai da thuc");
t3.Hien();
}
DATHUC t4 = t1.Hieu(t2);
if (t4 == null)
{
Console.WriteLine("Hai da thuc co kich co khac nhau");
}
else
{
Console.WriteLine("Hieu hai da thuc");
t4.Hien();
}
Console.ReadKey();
}
public DATHUC Hieu(DATHUC T2)
{
if (this.n == T2.n)
{
DATHUC t = new DATHUC(this.n);
for (int i = 0; i < n; i++)
{
t.a[i] = this.a[i] - T2.a[i];
}
return(t);
}
else
{
return(null);
}
}
