# C++ Program to Implement Ternary Tree

A ternary tree, is a tree data structure in which each node has at most three child nodes, usually represented as “left”, “mid” and “right”. In this tree, nodes with children are parent nodes, and child nodes may contain references to their parents. This is a C++ Program to Implement Ternary Tree and traversal of the tree.

## Algorithm

Begin
Declare function insert(struct nod** root, char *w)
if (!(*root)) then
*root = newnod(*w);
if ((*w) < (*root)->d) then
insert(&( (*root)->l ), w);
else if ((*w) > (*root)->d) then
insert(&( (*root)->r ), w);
else if (*(w+1))
insert(&( (*root)->eq ), w+1);
else
(*root)->EndOfString = 1;
End.

For Traversal of tree:

Begin
Declare function traverseTTtil(struct nod* root, char* buffer,
int depth)
if (root) then
traverseTTtil(root->l, buffer, depth)
buffer[depth] = root->d
if (root->EndOfString) then
buffer[depth+1] = '\0'
print the value of buffer.
traverseTTtil(root->eq, buffer, depth + 1);
traverseTTtil(root->r, buffer, depth);
End.

## Example

#include<stdlib.h>
#include<iostream>
using namespace std;
struct nod {
char d;
unsigned End.
fString: 1;
struct nod *l, *eq, *r;
}*t = NULL;
struct nod* newnod(char d) {
t = new nod;
t->d = d;
t->End.
fString = 0;
t->l = t->eq = t->r = NULL;
return t;
}
void insert(struct nod** root, char *w) {
if (!(*root))
*root = newnod(*w);
if ((*w) < (*root)->d)
insert(&( (*root)->l ), w);
else if ((*w) > (*root)->d)
insert(&( (*root)->r ), w);
else {
if (*(w+1))
insert(&( (*root)->eq ), w+1);
else
(*root)->End.
fString = 1;
}
}
void traverseTTtil(struct nod* root, char* buffer, int depth) {
if (root) {
traverseTTtil(root->l, buffer, depth);
buffer[depth] = root->d;
if (root->End. String) {
buffer[depth+1] = '\0';
cout<<buffer<<endl;
}
traverseTTtil(root->eq, buffer, depth + 1);
traverseTTtil(root->r, buffer, depth);
}
}
void traverseTT(struct nod* root) {
char buffer[50];
traverseTTtil(root, buffer, 0);
}
int main() {
struct nod *root = NULL;
insert(&root, "mat");
insert(&root, "bat");
insert(&root, "hat");
insert(&root, "rat");
cout<<"Following is traversal of ternary tree\n";
traverseTT(root);
}

## Output

Following is traversal of ternary tree
bat
hat
mat
rat