Find Height of a Tree

#include<stdio.h>


#include<stdlib.h>


struct treeNode
{
    int data;
    struct treeNode* left;
    struct treeNode* right;

};


struct treeNode* newNode(int n)
{
    struct treeNode* node = (struct treeNode*) malloc(sizeof(struct treeNode));
    node->data = n;
    node->left = NULL;
    node->right = NULL;
    return  node;

}

int maxDepth(struct treeNode* root)
{
    if (root == NULL)
        return 0;
    else
           
    {   

        return ( max(maxDepth( root->left) , maxDepth(root->right) ) + 1 );
    }
}

int main()
{
    struct treeNode *root = newNode(1);

    root->left = newNode(2);
    root->right = newNode(3);
    root->left->left = newNode(4);
    root->left->right = newNode(5);

    printf("Hight of tree is %d", maxDepth(root));

    getchar();
    return 0;
   
}