added a c prgrm for basic funcns on binary search tree

C/tree.c

@@ -0,0 +1,142 @@
+#include<stdio.h>
+#include<stdlib.h>
+
+typedef struct node
+{
+    int data;
+    struct node* left;
+    struct node* right;
+}node;
+
+
+node* create(int x){
+    node* new=(node *)malloc(sizeof(node));
+    new->data=x;
+    new->left=NULL;
+    new->right=NULL;
+    return new;
+}
+
+node* insert(node* root,int x){
+    if(root==NULL){
+        root=create(x);
+        return root;
+    }
+
+    if(root->data > x) root->left=insert(root->left, x);
+    else if(root->data < x) root->right=insert(root->right, x);
+    else printf("\nAlready Exist\n");
+
+    return root;
+
+
+}
+
+void inorder(node* root){
+    if(root!=NULL){
+        inorder(root->left);
+        printf("%d ",root->data);
+        inorder(root->right);
+    }
+
+}
+
+void freeTree(node* root){
+    if(root!=NULL){
+        freeTree(root->left);
+        free(root);
+        freeTree(root->right);
+    }
+}
+
+node* search(node* root, int x){
+    if(root==NULL) return NULL;
+    if(root->data==x) return root;
+    else if(root->data > x){
+        return search(root->left,x);
+    }
+    else return search(root->right, x);
+}
+
+node* delete_node(node* root, int k){
+    if(root==NULL){
+    printf("%d does not exist",k);
+      return root;  
+    } 
+    if(root->data > k) root->left=delete_node(root->left,k);
+    else if(root->data < k) root->right=delete_node(root->right,k);
+    else{
+        if(root->left==NULL && root->right==NULL){
+            free(root);
+            return NULL;
+        }
+        if(root->right==NULL){
+            node* temp=root->left;
+            free(root);
+            return temp;
+        }
+        if(root->left==NULL){
+            node* temp=root->right;
+            free(root);
+            return temp;
+        }
+        if(root->left !=NULL && root->right!=NULL){
+            node* curr=root->right;
+            while(curr!=NULL && curr->left!=NULL){
+                curr=curr->left;
+            }
+            root->data=curr->data;
+            root->right=delete_node(root->right, curr->data);
+            return root;
+        }
+    }
+    return root;
+}
+
+int main(){
+    node* root=NULL;
+    int ch,x;
+    do{
+        printf("\n1.Insert\n");
+        printf("2.Display\n");
+        printf("3.Delete\n");
+        printf("4.Exit\n");
+        printf("Enter choice: ");
+        scanf("%d",&ch);
+        if(ch==4){
+            freeTree(root);
+            printf("\nexiting..");
+            break;
+        }
+        switch (ch)
+        {
+            case 1:
+            printf("\nenter no: to insert: ");
+            scanf("%d",&x);
+            root=insert(root, x);
+            break;
+        case 2:
+            if(root) inorder(root);
+            else printf("\nEmpty tree");
+            printf("\n");
+            break;
+        case 3:
+            if(root){
+                    inorder(root);
+                    printf("enter node to delete: ");
+                    scanf("%d",&x);
+                    root=delete_node(root,x);
+                    printf("deleted %d succesfully!\n",x);
+            }
+            else printf("Empty tree\n");
+            break;
+        case 4:
+            break;
+        default:
+            break;
+        }
+    }while(ch!=4);
+
+    return 0;
+
+}