Count Number of Nodes at each level
Write a C Program to Count Number of Nodes at each level in Binary Tree. Here’s simple Program to Find Number of Nodes at a level in Binary Tree in C Programming Language.
What is Tree ?
In linear data structure, data is organized in sequential order and in non-linear data structure, data is organized in random order. Tree is a very popular data structure used in wide range of applications.
A tree data structure can be defined as follows…
- Tree is a non-linear data structure which organizes data in hierarchical structure and this is a recursive definition.
A tree data structure can also be defined as follows…
- Tree data structure is a collection of data (Node) which is organized in hierarchical structure and this is a recursive definition.
Every individual element is called as Node. Node in a tree data structure, stores the actual data of that particular element and link to next element in hierarchical structure.
Below is the source code for C Program to Count Number of Nodes at each level in Binary Tree which is successfully compiled and run on Windows System to produce desired output as shown below :
SOURCE CODE : :
/* C Program to Count Number of Nodes at each level in Binary Tree */
#include<stdio.h>
#include<stdlib.h>
struct node
{
struct node *lchild;
int info;
struct node *rchild;
};
struct node *insert(struct node *ptr, int ikey);
void display(struct node *ptr,int level);
int NodesAtLevel(struct node *ptr, int level) ;
int main()
{
struct node *root=NULL,*root1=NULL,*ptr;
int choice,k,item,level;
while(1)
{
printf("\n");
printf("1.Insert Tree \n");
printf("2.Display Tree \n");
printf("3.Number of Nodes \n");
printf("4.Quit\n");
printf("\nEnter your choice : ");
scanf("%d",&choice);
switch(choice)
{
case 1:
printf("\nEnter the key to be inserted : ");
scanf("%d",&k);
root = insert(root, k);
break;
case 2:
printf("\n");
display(root,0);
printf("\n");
break;
case 3:
printf("\n");
printf("Enter any level :: ");
scanf("%d",&level);
printf("\nNumber of nodes at [ %d ] Level :: %d\n",level,NodesAtLevel(root,level));
break;
case 4:
exit(1);
default:
printf("\nWrong choice\n");
}/*End of switch */
}/*End of while */
return 0;
}/*End of main( )*/
struct node *insert(struct node *ptr, int ikey )
{
if(ptr==NULL)
{
ptr = (struct node *) malloc(sizeof(struct node));
ptr->info = ikey;
ptr->lchild = NULL;
ptr->rchild = NULL;
}
else if(ikey < ptr->info) /*Insertion in left subtree*/
ptr->lchild = insert(ptr->lchild, ikey);
else if(ikey > ptr->info) /*Insertion in right subtree */
ptr->rchild = insert(ptr->rchild, ikey);
else
printf("\nDuplicate key\n");
return(ptr);
}/*End of insert( )*/
void display(struct node *ptr,int level)
{
int i;
if(ptr == NULL )/*Base Case*/
return;
else
{
display(ptr->rchild, level+1);
printf("\n");
for (i=0; i<level; i++)
printf(" ");
printf("%d", ptr->info);
display(ptr->lchild, level+1);
}
}/*End of display()*/
int NodesAtLevel(struct node *ptr, int level)
{
if(ptr==NULL)
return 0;
if(level==0)
return 1;
return NodesAtLevel(ptr->lchild,level-1) + NodesAtLevel(ptr->rchild,level-1);
}/*End of NodesAtLevel()*/
OUTPUT : :
/* C Program to Count Number of Nodes at each level in Binary Tree */
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 7
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 5
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 6
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 4
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 2
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 13
Wrong choice
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 11
Wrong choice
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 3
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 1
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 8
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 9
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 1
Enter the key to be inserted : 10
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 2
10
9
8
7
6
5
4
3
2
1
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 0
Number of nodes at [ 0 ] Level :: 1
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 1
Number of nodes at [ 1 ] Level :: 2
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 2
Number of nodes at [ 2 ] Level :: 3
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 3
Number of nodes at [ 3 ] Level :: 2
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 4
Number of nodes at [ 4 ] Level :: 2
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 3
Enter any level :: 5
Number of nodes at [ 5 ] Level :: 0
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 2
10
9
8
7
6
5
4
3
2
1
1.Insert Tree
2.Display Tree
3.Number of Nodes
4.Quit
Enter your choice : 4
Process returned 1
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