C++ exercises and solutions: Search node in binary tree

Search node in binary search tree

Step 5: Searching for a node in the tree

To search for a node in the tree, we need a recursive function find(). This function firstly tests whether the tree is empty. If the tree is not empty, the target value is compared firstly with the data of the root node. If the target value is less than the data of the root node, the search process will continue to left side. It continues to the right side if the target value is greater than the data. The process stops when the data of a node is equal to the target value or when it reaches the end of the tree.

template <class Type>
Node<Type> *BSTree<Type>::find(Node<Type> *T, const Type Tar)


    if(T==NULL) return NULL;
    if(Tar<T->data) //look in the left side
        return find(T->pLeft,Tar);
    else if(Tar>T->data)//look in the right side
        return find(T->pRight,Tar);
    else return T; //found node


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