Give the inorder,postorder& preorder forms of a tree in a single traversal

Give the inorder,postorder& preorder forms of a tree in a single traversal
Traverse(s)
{
If(s)
{
Preorder_queue(s);
Traverse(s->left);
Inorder_queue(s);
Traverse(s->right);
Postorder_queue(s);
}
}