Decimal Equivalent of Binary Linked List

Given a singly linked list of 0s and 1s find its decimal equivalent. 

   Input  : 0->0->0->1->1->0->0->1->0
   Output : 50   

   Input  : 1->0->0
   Output : 4

Decimal Value of an empty linked list is considered as 0.

Initialize result as 0. Traverse the linked list and for each node, multiply the result by 2 and add node’s data to it.

C++



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// C++ Program to find decimal value of 
// binary linked list 
#include <bits/stdc++.h>
using namespace std;
  
/* Link list Node */
class Node 
{ 
    public:
    bool data; 
    Node* next; 
}; 
  
/* Returns decimal value of binary linked list */
int decimalValue(Node *head) 
{ 
    // Initialized result 
    int res = 0; 
  
    // Traverse linked list 
    while (head != NULL) 
    { 
        // Multiply result by 2 and add 
        // head's data 
        res = (res << 1) + head->data; 
  
        // Move next 
        head = head->next; 
    } 
    return res; 
} 
  
// Utility function to create a new node. 
Node *newNode(bool data) 
{ 
    Node *temp = new Node; 
    temp->data = data; 
    temp->next = NULL; 
    return temp; 
} 
  
/* Drier program to test above function*/
int main() 
{ 
    /* Start with the empty list */
    Node* head = newNode(1); 
    head->next = newNode(0); 
    head->next->next = newNode(1); 
    head->next->next->next = newNode(1); 
  
    cout << "Decimal value is "
        << decimalValue(head); 
  
    return 0; 
} 
  
// This is code is contributed by rathbhupendra

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C














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// C Program to find decimal value of 


// binary linked list 


#include<iostream> 


using namespace std; 


  


/* Link list Node */


struct Node 


{ 


    bool data; 


    struct Node* next; 


}; 


  


/* Returns decimal value of binary linked list */


int decimalValue(struct Node *head) 


{ 


    // Initialized result 


    int  res = 0; 


  


    // Traverse linked list 


    while (head != NULL) 


    { 


        // Multiply result by 2 and add 


        // head's data 


        res = (res  << 1) + head->data; 


  


        // Move next 


        head = head->next; 


    } 


    return res; 


} 


  


// Utility function to create a new node. 


Node *newNode(bool data) 


{ 


    struct Node *temp = new Node; 


    temp->data = data; 


    temp->next = NULL; 


    return temp; 


} 


  


/* Drier program to test above function*/


int main() 


{ 


    /* Start with the empty list */


    struct Node* head = newNode(1); 


    head->next = newNode(0); 


    head->next->next = newNode(1); 


    head->next->next->next = newNode(1); 


  


    cout << "Decimal value is "


         << decimalValue(head); 


  


    return 0; 


} 



















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// Java Program to find decimal value of  


// binary linked list  


class GFG 


{ 


      


// Link list Node / 


static class Node  


{  


    boolean data;  


    Node next;  


};  


  


// Returns decimal value of binary linked list / 


static int decimalValue( Node head)  


{  


    // Initialized result  


    int res = 0;  


  


    // Traverse linked list  


    while (head != null)  


    {  


        // Multiply result by 2 and add  


        // head's data  


        res = (res << 1) + (head.data?1:0);  


  


        // Move next  


        head = head.next;  


    }  


    return res;  


}  


  


// Utility function to create a new node.  


static Node newNode(int data)  


{  


    Node temp = new Node();  


    temp.data = (data==1? true:false);  


    temp.next = null;  


    return temp;  


}  


  


// Driver code/ 


public static void main(String args[]) 


{  


    // Start with the empty list / 


    Node head = newNode(1);  


    head.next = newNode(0);  


    head.next.next = newNode(1);  


    head.next.next.next = newNode(1);  


  


    System.out.print( "Decimal value is "+decimalValue(head));  


} 


} 


  


// This code is contributed by Arnab Kundu 



















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// C# Program to find decimal value of  


// binary linked list  


using System; 


  


class GFG 


{ 


      


// Link list Node / 


public class Node  


{  


    public Boolean data;  


    public Node next;  


};  


  


// Returns decimal value of binary linked list 


static int decimalValue( Node head)  


{  


    // Initialized result  


    int res = 0;  


  


    // Traverse linked list  


    while (head != null)  


    {  


        // Multiply result by 2 and add  


        // head's data  


        res = (res << 1) + (head.data ? 1 : 0);  


  


        // Move next  


        head = head.next;  


    }  


    return res;  


}  


  


// Utility function to create a new node.  


static Node newNode(int data)  


{  


    Node temp = new Node();  


    temp.data = (data == 1 ? true : false);  


    temp.next = null;  


    return temp;  


}  


  


// Driver cod 


public static void Main(String []args) 


{  


    // Start with the empty list  


    Node head = newNode(1);  


    head.next = newNode(0);  


    head.next.next = newNode(1);  


    head.next.next.next = newNode(1);  


  


    Console.WriteLine("Decimal value is " +  


                       decimalValue(head));  


} 


} 


  


// This code is contributed by Rajput-Ji 



















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Output : 


Decimal value is 11




This article is contributed by Shivam Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.


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