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C++ Program for Inorder Tree Traversal without Recursion
If a binary tree is traversed in-order, the left subtree is visited first, then the root and later the right sub-tree. The output the key in ascending order in in_order traversal. This is a C++ Program for Inorder Tree Traversal without Recursion.
Algorithm
Begin Function inOrder(): Declare a stack s. Declare the current node as root. While current node is not null and stack is not empty do While current node is not null do Push the current node on the top of the stack Make the left child node as current node Point the current node at the top of the stack. Pop the top most node from the stack Print the current node. Make the right node as current node. Insert some elements at root, left node and right node in stack. Call the inOrder() function to traverse the tree. End.
Example Code
#include<bits/stdc++.h>
using namespace std;
struct n {
int d;
struct n* l;
struct n* r;
n (int d) {
this->d = d;
l = r = NULL;
}
};
void inOrder(struct n *root) {
stack<n *> s;
n *current = root;
while (current != NULL || s.empty() == false) {
while (current != NULL) {
s.push(current);
current = current->l;
}
current = s.top();
s.pop();
cout << current->d << " ";
current = current->r;
}
}
int main() {
struct n *root = new n(7);
root->l = new n(6);
root->r = new n(2);
root->l->l = new n(1);
root->l->r = new n(9);
inOrder(root);
return 0;
}Output
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Updated on: 30-Jul-2019
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