Check out example codes for "root to leaf path print". It will help you in understanding the concepts better.

Code Example 1

``````#include <bits/stdc++.h>
using namespace std;

/* A binary tree node has data, pointer to left child
and a pointer to right child */
class node
{
public:
int data;
node* left;
node* right;
};

/* Prototypes for funtions needed in printPaths() */
void printPathsRecur(node* node, int path[], int pathLen);
void printArray(int ints[], int len);

/*Given a binary tree, print out all of its root-to-leaf
paths, one per line. Uses a recursive helper to do the work.*/
void printPaths(node* node)
{
int path;
printPathsRecur(node, path, 0);
}

/* Recursive helper function -- given a node,
and an array containing the path from the root
node up to but not including this node,
print out all the root-leaf paths.*/
void printPathsRecur(node* node, int path[], int pathLen)
{
if (node == NULL)
return;

/* append this node to the path array */
path[pathLen] = node->data;
pathLen++;

/* it's a leaf, so print the path that led to here */
if (node->left == NULL && node->right == NULL)
{
printArray(path, pathLen);
}
else
{
/* otherwise try both subtrees */
printPathsRecur(node->left, path, pathLen);
printPathsRecur(node->right, path, pathLen);
}
}

/* UTILITY FUNCTIONS */
/* Utility that prints out an array on a line. */
void printArray(int ints[], int len)
{
int i;
for (i = 0; i < len; i++)
{
cout << ints[i] << " ";
}
cout<<endl;
}

/* utility that allocates a new node with the
given data and NULL left and right pointers. */
node* newnode(int data)
{
node* Node = new node();
Node->data = data;
Node->left = NULL;
Node->right = NULL;

return(Node);
}

/* Driver code*/
int main()
{

/* Constructed binary tree is
10
/ \
8 2
/ \ /
3 5 2
*/
node *root = newnode(10);
root->left = newnode(8);
root->right = newnode(2);
root->left->left = newnode(3);
root->left->right = newnode(5);
root->right->left = newnode(2);

printPaths(root);
return 0;
}

// This code is contributed by rathbhupendra``````

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