Tree Traversal and Node, C++ (clang)

Language: Layout:

// Example program using TreeNode

#include <iostream>
using namespace std;

template<class ItemType>
class TreeNode
{
private:
   ItemType        item; // A data item
   TreeNode<ItemType>* leftChild; // Pointer to left child
   TreeNode<ItemType>* rightChild; // Pointer to left child
   
public:
    TreeNode() {leftChild = nullptr; rightChild = nullptr;};
    void setItem(const ItemType& anItem) {item = anItem;};
    void setLeft(TreeNode<ItemType>* treeNodePtr) {leftChild = treeNodePtr;};
    void setRight(TreeNode<ItemType>* treeNodePtr) {rightChild = treeNodePtr;};
    ItemType getItem() const {return item;};
    TreeNode<ItemType>* getLeft() const {return leftChild;};
    TreeNode<ItemType>* getRight() const {return rightChild;};
}; // end TreeNode

template<class ItemType>
void treeSearch(TreeNode<ItemType> *node)
{
    if (node == nullptr) 
    {
        return;
    }
    if (node->getLeft() != nullptr)
    {
        cout << "(";
    }
    treeSearch(node->getLeft());
    cout << node->getItem();   
    
    treeSearch(node->getRight());  
    if (node->getRight() != nullptr)
    {
        cout << ")";
    }
  // Post-Traversal Order:  cout << node->getItem() << " ";
}

int main()
{
    cout << "*** Tree Example Program for ECE 2574 ***\n\n";
    TreeNode<char> node0; node0.setItem('*'); 
    TreeNode<char> node10; node10.setItem('+'); node0.setLeft(&node10);
    TreeNode<char> node11; node11.setItem('-'); node0.setRight(&node11);
    TreeNode<char> node20; node20.setItem('a'); node10.setLeft(&node20);
    TreeNode<char> node21; node21.setItem('b'); node10.setRight(&node21);
    TreeNode<char> node22; node22.setItem('c'); node11.setLeft(&node22);
    TreeNode<char> node23; node23.setItem('d'); node11.setRight(&node23);

// set root and search tree
    TreeNode<char> *root = &node0;    
    treeSearch(root);
    cout << endl;
    
    return 0;
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 0.73 sec, absolute running time: 0.21 sec, cpu time: 0.13 sec, memory peak: 3 Mb, absolute service time: 0,94 sec