bitgeo.cs

void Main()
{
	int id = 0;
	id |= 1 << 11;
	id |= 1 << 5;
	id |= 1 << 2;
	int id2 = 0;
	id2 |= 1 << 1;
	id2 |= 1 << 5;
	id2 |= 1 << 10;
	var eqId = 0;
	int numMatch = 0;
	for (int i = 31; i >= 0; i--)
	{
		if(((id >> i)& 1) != ((id2 >> i)& 1))
			break;
		numMatch++;
		eqId |= ((id >> i)& 1) << i;
	}
	eqId >>= 32-(numMatch);
	Console.WriteLine($"0b{Convert.ToString(id, 2)}");
	Console.WriteLine($"0b{Convert.ToString(id2, 2)}");
	Console.WriteLine($"0b{Convert.ToString(eqId, 2)}");
	Console.WriteLine(id);
	Console.WriteLine(id2);
	Console.WriteLine(eqId);
}