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Copy pathBST with C
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BST with C
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#include <stdio.h>
#include <stdlib.h>
struct node
{
int key;
struct node *left;
struct node *right;
};
typedef struct node Node;
void insert(Node **T, int k);
void inorder(Node *T);
void preorder(Node *T);
void postorder(Node *T);
void display(Node *T);
void display1(Node *T);
void display2(Node *T);
int height(Node *T);
int main()
{
int ch,h;
int k;
Node *T=NULL;
while(1) {
printf("0: exit\n");
printf("1: insert\n");
printf("2: delete\n");
printf("3: display\n");
printf("4: level order traversal\n");
printf("5: in order traversal\n");
printf("6: pre order traversal\n");
printf("7: post order traversal\n");
printf("8: height of the tree\n");
printf("Enter your choice: ");
scanf("%d",&ch);
switch(ch) {
case 0: return(0);
case 1:
printf("Enter a key: ");
scanf("%d",&k);
insert(&T,k);
printf("\n\n");
break;
case 3:
display(T);
printf("\n\n");
break;
case 5:
display(T);
printf("inorder: ");
inorder(T);
printf("\n\n");
break;
case 6:
display(T);
printf("preorder: ");
preorder(T);
printf("\n\n");
break;
case 7:
display(T);
printf("postorder: ");
postorder(T);
printf("\n\n");
break;
case 8:
h=height(T);
printf("height=%d\n",h);
printf("\n\n");
break;
default:
printf("Enter a valid choice\n");
}
}
return 0;
}
void insert(Node **T,int k)
{
/**Create a new node **/
Node *n;
n= (Node*) malloc(sizeof(Node));
n->key=k;
n->left=NULL;
n->right=NULL;
/**************************/
/**For empty tree new node is the root node **/
if(*T==NULL) {
*T=n;
return;
}
/**************************/
/**Find Parent of new node **/
Node *t=*T, *par=NULL;
while(t != NULL) {
par=t;
if(k < t->key) {
t=t->left;
}
else {
t=t->right;
}
}
/**************************/
/**Insert the new node **/
if(k < par->key) {
par->left=n;
}
else {
par->right=n;
}
/**************************/
}
void inorder(Node *T)
{
if(T!=NULL) {
inorder(T->left);
printf("%d ",T->key);
inorder(T->right);
}
}
void preorder(Node *T)
{
if(T!=NULL) {
printf("%d ",T->key);
preorder(T->left);
preorder(T->right);
}
}
void postorder(Node *T)
{
if(T!=NULL) {
postorder(T->left);
postorder(T->right);
printf("%d ",T->key);
}
}
void display(Node *T)
{
int h=height(T);
switch(h) {
case 0:
printf(" %d\n",T->key);
break;
case 1:
display1(T);
break;
case 2:
display2(T);
break;
default:
printf("display with height %d is not supported\n",h);
}
}
int height(Node *T)
{
if(T==NULL) {
return 0;
}
else if(T->left == NULL && T->right==NULL) {
return 0;
}
else {
int l=height(T->left);
int r=height(T->right);
if(l>r) return (l+1);
else return (r+1);
}
}
void display1(Node *T)
{
printf(" %d\n",T->key);
if(T->left !=NULL && T->right!=NULL) {
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T->left->key,T->right->key);
}
else if(T->left !=NULL) {
printf(" /\n");
printf(" /\n");
printf(" %d\n",T->left->key);
}
else {
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T->right->key);
}
}
void display2(Node *T)
{
printf(" %d\n",T->key);
if(T->left !=NULL && T->right!=NULL) {
printf(" / \\\n");
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T->left->key,T->right->key);
Node *T1=T->left;
Node *T2=T->right;
if(T1->left !=NULL && T1->right!=NULL && T2->left !=NULL && T2->right!=NULL)
{
printf(" / \\ / \\\n");
printf(" / \\ / \\\n");
printf(" %d %d %d %d\n",T1->left->key,T1->right->key,T2->left->key,T2->right->key);
}
else if(T1->left !=NULL && T1->right!=NULL && T2->left !=NULL && T2->right==NULL) {
printf(" / \\ /\n");
printf(" / \\ /\n");
printf(" %d %d %d\n",T1->left->key,T1->right->key,T2->left->key);
}
else if(T1->left !=NULL && T1->right!=NULL && T2->left ==NULL && T2->right!=NULL)
{
printf(" / \\ \\\n");
printf(" / \\ \\\n");
printf(" %d %d %d\n",T1->left->key,T1->right->key,T2->right->key);
}
else if(T1->left !=NULL && T1->right!=NULL && T2->left ==NULL && T2->right==NULL)
{
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T1->left->key,T1->right->key);
}
else if(T1->left !=NULL && T1->right==NULL && T2->left !=NULL && T2->right!=NULL)
{
printf(" / / \\\n");
printf(" / / \\\n");
printf(" %d %d %d\n",T1->left->key,T2->left->key,T2->right->key);
}
else if(T1->left !=NULL && T1->right==NULL && T2->left !=NULL && T2->right==NULL)
{
printf(" / /\n");
printf(" / /\n");
printf(" %d %d\n",T1->left->key,T2->left->key);
}
else if(T1->left !=NULL && T1->right==NULL && T2->left ==NULL && T2->right!=NULL)
{
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T1->left->key,T2->right->key);
}
else if(T1->left !=NULL && T1->right==NULL && T2->left ==NULL && T2->right==NULL)
{
printf(" /\n");
printf(" /\n");
printf(" %d\n",T1->left->key);
}
else if(T1->left ==NULL && T1->right!=NULL && T2->left !=NULL && T2->right!=NULL)
{
printf(" \\ / \\\n");
printf(" \\ / \\\n");
printf(" %d %d %d\n",T1->right->key,T2->left->key,T2->right->key);
}
else if(T1->left ==NULL && T1->right!=NULL && T2->left !=NULL && T2->right==NULL)
{
printf(" \\ /\n");
printf(" \\ /\n");
printf(" %d %d\n",T1->right->key,T2->left->key);
}
else if(T1->left ==NULL && T1->right!=NULL && T2->left ==NULL && T2->right!=NULL)
{
printf(" \\ \\\n");
printf(" \\ \\\n");
printf(" %d %d\n",T1->right->key,T2->right->key);
}
else if(T1->left ==NULL && T1->right!=NULL && T2->left ==NULL && T2->right==NULL)
{
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T1->right->key);
}
else if(T1->left ==NULL && T1->right==NULL && T2->left !=NULL && T2->right!=NULL)
{
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T2->left->key,T2->right->key);
}
else if(T1->left ==NULL && T1->right==NULL && T2->left !=NULL && T2->right==NULL)
{
printf(" /\n");
printf(" /\n");
printf(" %d\n",T2->left->key);
}
else if(T1->left ==NULL && T1->right==NULL && T2->left ==NULL && T2->right!=NULL)
{
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T2->right->key);
}
}
else if(T->left != NULL && T->right == NULL) {
printf(" /\n");
printf(" /\n");
printf(" /\n");
printf(" %d\n",T->left->key);
Node *T1=T->left;
if(T1->left !=NULL && T1->right!=NULL)
{
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T1->left->key,T1->right->key);
}
else if(T1->left !=NULL && T1->right==NULL) {
printf(" /\n");
printf(" /\n");
printf(" %d\n",T1->left->key);
}
else if(T1->left ==NULL && T1->right!=NULL)
{
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T1->right->key);
}
}
else if(T->left == NULL && T->right != NULL) {
printf(" \\\n");
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T->right->key);
Node *T2=T->right;
if(T2->left !=NULL && T2->right!=NULL)
{
printf(" / \\\n");
printf(" / \\\n");
printf(" %d %d\n",T2->left->key,T2->right->key);
}
else if(T2->left !=NULL && T2->right==NULL) {
printf(" /\n");
printf(" /\n");
printf(" %d\n",T2->left->key);
}
else if(T2->left ==NULL && T2->right!=NULL)
{
printf(" \\\n");
printf(" \\\n");
printf(" %d\n",T2->right->key);
}
}
}