This tutorial define tree data structure and display how to make a tree.

Description:

A tree data structure that are based on hierarchical tree structure with sets of nodes. A tree is a acyclic connected graph with zero or more children nodes and at most one parent nodes.

Code:

#include <stdio.h>
#include <stdlib.h>
struct node
{
  int data;
  struct node *lchild, *rchild;
};

struct node *insertN(struct node *p,int val)
{
   struct node *temp1,*temp2;
	if(p == NULL)
	{
		p = (struct node *) malloc(sizeof(struct node));
		if(p == NULL)
		  {
	printf("Cannot allocate memory\n");
	exit(0);
        }
	  p->data = val;
	  p->lchild=p->rchild=NULL;
 }
else
{
 temp1 = p;

while(temp1 != NULL)
{
  temp2 = temp1;
  if( temp1 ->data > val)
		 temp1 = temp1->lchild;
  else
		 temp1 = temp1->rchild;
}
if( temp2->data > val)
{
temp2->lchild = (struct node*)malloc(sizeof(struct node));
	temp2 = temp2->lchild;
   if(temp2 == NULL)
        {
	printf("Cannot allocate memory\n");
	exit(0);
        }
   temp2->data = val;
   temp2->lchild=temp2->rchild = NULL;
}
else
{
	temp2->rchild = (struct node*)malloc(sizeof(struct node));
	temp2 = temp2->rchild;
	if(temp2 == NULL)
        {
	printf("Cannot allocate memory\n");
	exit(0);
        }
	temp2->data = val;
	temp2->lchild=temp2->rchild = NULL;
}
}
return(p);
}

void display(struct node *p)
    {
		 if(p != NULL)
         {
			  display(p->lchild);
			  printf("%d\t",p->data);
			  display(p->rchild);
          }
	 }
void main()
{
  struct node *root = NULL;
  int n,x;
  printf("Enter the number of nodes for tree\n");
  scanf("%d",&n);
  while( n -- > 0)
    {
		 printf("Enter the data value\n");
		 scanf("%d",&x);
		 root = insertN(root,x);
   }
	 display(root);
  }

Output:

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