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public void preOrder(Tree root)
{
if (root == null) return;
Stack stk = new Stack();
st.add(root);
while (!stk.empty())
{
Tree node = stk.pop();
System.out.print(node.data + " ");
if (node.left != null) stk.push(node.left);
if (node.right != null) stk.push(node.right);
}
}
b)
public void preOrder(Tree root)
{
if (root == null) return;
Stack stk = new Stack();
while (!stk.empty())
{
Tree node = stk.pop();
System.out.print(node.data + " ");
if (node.right != null) stk.push(node.right);
if (node.left != null) stk.push(node.left);
}
}
c)
public void preOrder(Tree root)
{
if (root == null) return;
Stack stk = new Stack();
st.add(root);
while (!stk.empty())
{
Tree node = stk.pop();
System.out.print(node.data + " ");
if (node.right != null) stk.push(node.right);
if (node.left != null) stk.push(node.left);
}
}
d) None of the mentioned 