# Find the length of a linked list without using recursion

In this article, we are going to see how to find a linked list length without using recursion?
Submitted by Piyas Mukherjee, on January 24, 2019

Solution:

Algorithm to find length

Input:

A singly linked list whose address of the first node is stored in a pointer, say head.

Output:

The no of nodes in the list, c

Data structure used:

Singly linked list where each node contains a data element say data, and the address of the immediate next node say next, with head holding the address of the first node.

Pseudo code:

Begin
c=0 //counter to store count of nodes
While(temp!=NULL) //upto end of linked list
begin
c=c+1
temp=temp->next
End while
End

C code:

#include <stdio.h>
#include <stdlib.h>

//node sructure
typedef struct list
{
int data;
struct list *next;
}node;

int length(node *temp);

int main()
{
int choice,count;
do
{
temp=(node *)malloc(sizeof(node));
if(temp!=NULL)
{
printf("\nEnter the element in the list : ");
scanf("%d",&temp->data);
temp->next=NULL;
{
}
else
{
while(temp1->next!=NULL)
{
temp1=temp1->next;
}
temp1->next=temp;
}
}
else
{
printf("\nMemory not avilable...node allocation is not possible");
}
printf("\nIf you wish to add more data on the list enter 1 : ");
scanf("%d",&choice);
}while(choice==1);

//Now counting the length of the list using a user defined function
printf("\nThe length of the list is : %d",count);

return 0;
}

//function to find length iteratively
int length(node *temp)
{
int c=0;
//travarsing to the end of the list and count the number of nodes
while(temp!=NULL)
{
c=c+1;
temp=temp->next;
}
return c;
}

Output

Enter the element in the list : 1

If you wish to add more data on the list enter 1 : 1

Enter the element in the list : 2

If you wish to add more data on the list enter 1 : 1

Enter the element in the list : 3

If you wish to add more data on the list enter 1 : 1

Enter the element in the list : 4

If you wish to add more data on the list enter 1 : 1

Enter the element in the list : 5

If you wish to add more data on the list enter 1 : 0

The length of the list is : 5

Languages: » C » C++ » C++ STL » Java » Data Structure » C#.Net » Android » Kotlin » SQL
Web Technologies: » PHP » Python » JavaScript » CSS » Ajax » Node.js » Web programming/HTML
Solved programs: » C » C++ » DS » Java » C#
Aptitude que. & ans.: » C » C++ » Java » DBMS
Interview que. & ans.: » C » Embedded C » Java » SEO » HR
CS Subjects: » CS Basics » O.S. » Networks » DBMS » Embedded Systems » Cloud Computing
» Machine learning » CS Organizations » Linux » DOS
More: » Articles » Puzzles » News/Updates