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.

Recommended: Please solve it on “PRACTICE” first, before moving on to the solution.

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++

// 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 

C

// 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; 
} 

Java

// 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 

C#

// 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 

Output :

Decimal value is 11

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My Personal Notes

Recommended: Please solve it on “PRACTICE” first, before moving on to the solution.

C++

C

Java

C#

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