Binary search tree in c
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/*
*********** Binary Search Tree Menu ***********
[1] Insert value
[2] Print Tree (Preorder)
[3] Print Tree (inorder)
[4] Print Tree (postorder)
[5] Exit
*/
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/* Binary Search tree code by condingstreet.com */ #include<stdio.h> #include<stdlib.h> struct Tnode { int val; struct Tnode *left,*right; }; int create_node(int val,struct Tnode **node){ struct Tnode *tmp; tmp=malloc(sizeof(struct Tnode)); if(tmp==NULL) return 0; tmp->val=val; tmp->left=NULL; tmp->right=NULL; (*node)=tmp; return 1; } void insert_node(struct Tnode **Troot,struct Tnode **node){ struct Tnode *parent,*tmp; int val; if((*node)==NULL) return; if((*Troot)==NULL){ (*Troot)=(*node); return; } tmp=(*Troot); val=(*node)->val; while(tmp!=NULL){ parent=tmp; if(val<tmp->val) tmp=tmp->left; else tmp=tmp->right; } if(val<parent->val){ parent->left=(*node); } else parent->right=(*node); return; } void preorder(struct Tnode **Troot){ if((*Troot)!=NULL){ printf(" %d ",(*Troot)->val); preorder(&((*Troot)->left)); preorder(&((*Troot)->right)); } } void postorder(struct Tnode **Troot){ if((*Troot)!=NULL){ postorder(&((*Troot)->left)); postorder(&((*Troot)->right)); printf(" %d ",(*Troot)->val); } } void inorder(struct Tnode **Troot){ if((*Troot)!=NULL){ inorder(&((*Troot)->left)); printf(" %d ",(*Troot)->val); inorder(&((*Troot)->right)); } } int main(){ struct Tnode *root=NULL,*node; int key,ival; do{ printf("\n[1] Insert value"); printf("\n[2] Print Tree (Preorder) "); printf("\n[3] Print Tree (inorder) "); printf("\n[4] Print Tree (postorder) "); printf("\n[5] Exit "); printf("\nEnter the input key : "); scanf("%d",&key); switch(key){ case 1: printf("\n Enter the value to be inserted :"); scanf("%d",&ival); if(create_node(ival,&node)) insert_node(&root,&node); else printf("\n Memory is Full !! "); break; case 2: printf("\n Tree contents are :\n"); preorder(&root); break; case 3: printf("\n Tree contents are :\n"); inorder(&root); break; case 4: printf("\n Tree contents are :\n"); postorder(&root); break; case 5: break; default: printf("\t Enter the Correct key !!!!! "); break; } }while(key!=5); printf("\n Thank you for using codingstreet.com 's datastructure solution "); return 0; } |
Binary search tree in c.