Binary Search Tree

/* PROGRAM TO IMPLEMENT BINARY SEARCH TREE IN C*/

#include"stdio.h"
struct BT
{
int data;
struct BT *right,*left;
};

void insert(struct BT ** ptr,int d)
{
if((*ptr)==NULL)
{
(*ptr)=(struct BT*)malloc(sizeof(struct BT));
(*ptr)->data=d;
(*ptr)->left=(*ptr)->right=NULL;
}
else
{
if((*ptr)->data>d)
insert(&((*ptr)->left),d);
else
insert(&((*ptr)->right),d);
}
return;
}

int search(struct BT *ptr,int no)
{
if(ptr==NULL)
return(0);
if(ptr->data==no)
return(1);
if(ptr->data>no)
return(search(ptr->left,no));
else
return(search(ptr->right,no));
}

void inorder(struct BT *ptr)
{
if(ptr==NULL)
return;
else
{
inorder(ptr->left);
printf("\t%d",ptr->data);
inorder(ptr->right);
}
}

void preorder(struct BT*ptr)
{
if(ptr==NULL)
return;
else
{
printf("\t%d",ptr->data);
preorder(ptr->left);
preorder(ptr->right);
}
}
void postorder(struct BT*ptr)
{
if(ptr==NULL)
return;
else
{
postorder(ptr->left);
postorder(ptr->right);
printf("\t%d",ptr->data);
}
}
main()
{
struct BT*root;
int ch,d,no,f;

root=NULL;
while(ch!=6)
{
printf("\n 1.Insert\n 2.Search\n 3.Inorder\n 4.Preorder\n 5.Postorder\n 6.Exit\n");
printf("\n Enter the choice:");
scanf("%d",&ch);
switch(ch)
{
case 1:
printf("Enter the data:");

scanf("%d",&d);
insert(&root,d);
break;
case 2:
printf("Enter the node:");

scanf("%d",&no);
f=search(root,no);
if(f==0)
printf("Node is not present");
else
printf("Node is present");
break;
case 3:
inorder(root);

break;
case 4:
preorder(root);

break;
case 5:
postorder(root);

break;
case 6: break;
}
}
}

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History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
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printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();
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