# Write an algorithm that accepts a Tree as input and prints the correspondingBinary Tree – IGNOU MCA Assignment 2017 – 18

By | December 20, 2017

MASTER OF COMPUTER APPLICATIONS

Course Code : MCS-021
Course Title : Data and File Structures
Assignment Number : MCA(2)/021/Assignment/17-18
Maximum Marks : 100
Weightage : 25%

## CODE:

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

struct tnode *insert(struct tnode *p,int val)
{
struct tnode *temp1,*temp2;
if(p == NULL)
{
p = (struct tnode *) malloc(sizeof(struct tnode));
/* insert the new node as root node*/
if(p == NULL)
{
printf(“Cannot allocate\n”);
exit(0);
}
p->data = val;
p->lchild=p->rchild=NULL;
}
else
{
temp1 = p;
/* traverse the tree to get a pointer to that node
whose child will be the newly created node*/
while(temp1 != NULL)
{
temp2 = temp1;
if( temp1 ->data > val)
temp1 = temp1->lchild;
else
temp1 = temp1->rchild;
}
if( temp2->data > val)
{
temp2->lchild = (struct tnode*)malloc(sizeof(struct tnode));
/*inserts the newly created node as left child*/
temp2 = temp2->lchild;
if(temp2 == NULL)
{
printf(“Cannot allocate\n”);
exit(0);
}
temp2->data = val;
temp2->lchild=temp2->rchild = NULL;
}
else
{
temp2->rchild = (struct tnode*)malloc(sizeof(struct tnode));
/*inserts the newly created node as left child*/
temp2 = temp2->rchild;
if(temp2 == NULL)
{
printf(“Cannot allocate\n”);
exit(0);
}
temp2->data = val;
temp2->lchild=temp2->rchild = NULL;
}
}
return(p);
}
/* a function to binary tree in preorder */
void preorder(struct tnode *p)
{
if(p != NULL)
{
printf(“%d\t”,p->data);
preorder(p->lchild);
preorder(p->rchild);
}
}
/* a function to binary tree in inorder */
void inorder(struct tnode *p)
{
if(p != NULL)
{
inorder(p->lchild);
printf(“%d\t”,p->data);
inorder(p->rchild);
}
}
/* a function to binary tree in postorder */
void postorder(struct tnode *p)
{
if(p != NULL)
{
postorder(p->lchild);
postorder(p->rchild);
printf(“%d\t”,p->data);
}
}
void main()
{
struct tnode *root = NULL;
int n,x;
clrscr();
printf(“\nEnter the number of nodes\n”);
scanf(“%d”,&n);
while(n!=0)
{
printf(“Enter the data value\n”);
scanf(“%d”,&x);
root = insert(root,x);
n–;
}
printf(“\n**THIS TREE IS BINARY TREE**\n”);

printf(“\nPREORDER OF TREE : \n”);
preorder(root);
printf(“\nINORDER OF TREE : \n”);
inorder(root);
printf(“\nPOSTORDER OF TREE : \n”);
postorder(root);
getch();

}

 Source code
```#include <stdio.h>
#include <stdlib.h>
struct tnode
{
int data;
struct tnode *lchild, *rchild;
};
struct tnode *insert(struct tnode *p,int val)
{
struct tnode *temp1,*temp2;
if(p == NULL)
{
p = (struct tnode *) malloc(sizeof(struct tnode));
/* insert the new node as root node*/
if(p == NULL)
{
printf("Cannot allocate\n");
exit(0);
}
p->data = val;
p->lchild=p->rchild=NULL;
}
else
{
temp1 = p;
/* traverse the tree to get a pointer to that node
whose child will be the newly created node*/
while(temp1 != NULL)
{
temp2 = temp1;
if( temp1 ->data > val)
temp1 = temp1->lchild;
else
temp1 = temp1->rchild;
}
if( temp2->data > val)
{
temp2->lchild = (struct tnode*)malloc(sizeof(struct tnode));
/*inserts the newly created node as left child*/
temp2 = temp2->lchild;
if(temp2 == NULL)
{
printf("Cannot allocate\n");
exit(0);
}
temp2->data = val;
temp2->lchild=temp2->rchild = NULL;
}
else
{
temp2->rchild = (struct tnode*)malloc(sizeof(struct tnode));
/*inserts the newly created node as left child*/
temp2 = temp2->rchild;
if(temp2 == NULL)
{
printf("Cannot allocate\n");
exit(0);
}
temp2->data = val;
temp2->lchild=temp2->rchild = NULL;
}
}
return(p);
}
/* a function to binary tree in preorder */
void preorder(struct tnode *p)
{
if(p != NULL)
{
printf("%d\t",p->data);
preorder(p->lchild);
preorder(p->rchild);
}
}
/* a function to binary tree in inorder */
void inorder(struct tnode *p)
{
if(p != NULL)
{
inorder(p->lchild);
printf("%d\t",p->data);
inorder(p->rchild);
}
}
/* a function to binary tree in postorder */
void postorder(struct tnode *p)
{
if(p != NULL)
{
postorder(p->lchild);
postorder(p->rchild);
printf("%d\t",p->data);
}
}
void main()
{
struct tnode *root = NULL;
int n,x;
clrscr();
printf("\nEnter the number of nodes\n");
scanf("%d",&n);
while(n!=0)
{
printf("Enter the data value\n");
scanf("%d",&x);
root = insert(root,x);
n--;
}
printf("\n**THIS TREE IS BINARY TREE**\n");
printf("\nPREORDER OF TREE : \n");
preorder(root);
printf("\nINORDER OF TREE : \n");
inorder(root);
printf("\nPOSTORDER OF TREE : \n");
postorder(root);
getch();
}```

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