/*
*add node to the list
*/
public void addNode(int value, int sub, bool mark)
{
Node temp = new Node();
if (size == 0)
head = tail = temp;
else
{
tail.Next = temp;
tail = temp;
}
size++;
temp.Value = value;
temp.Sub = sub;
temp.Mark = mark;
}
/*
* checkVaryByOneDigite checks if the two values vary by one digit.
*/
private bool checkVaryByOneDigit(Node temp, Node ntemp)
{
int v, nv;
int s, ns;
int subt;
v = temp.Value;
nv = ntemp.Value;
s = temp.Sub;
ns = ntemp.Sub;
subt = Math.Abs(v - nv);
if (subt == 0 || s != ns)
{
return false;
}
else if (subt == 1)
{
if (v % 2 == 0)
return true;
else
return false;
}
else if (checkPowerOfTwo(subt))
{
if (((v / subt) % 2) == 0)
return true;
else
return false;
}
return
false;
}
/************************************************************
* Quine–McCluskey algorithm
* Minimize is the function that minimize the truth table.
*************************************************************
*/
private TList minimize(TList mtable)
{
Node temp = new Node();
Node ntemp = new Node();
TList res = new TList();
bool check_end = true;
int subt = 0;
temp = mtable.Head;
while (temp != null)
{
ntemp = temp.Next;
while (ntemp != null)
{
subt = ntemp.Value - temp.Value;
if (checkVaryByOneDigit(temp, ntemp))
{
if ((res.Head == null) || (res.Tail.Value != temp.Value)
|| (res.Tail.Sub != temp.Sub + subt))
res.addNode(temp.Value, temp.Sub + subt, false);
check_end = false;
temp.Mark = true;
ntemp.Mark = true;
}
ntemp = ntemp.Next;
}
if (!temp.Mark)
res.addNode(temp.Value, temp.Sub, false);
temp = temp.Next;
}
if (check_end)
return res;
return minimize(res);
}
public TList()
{
size = 0;
head = null;
tail = null;
}
public Node()
{
value = -1;
sub = 0;
next = null;
mark = false;
}