Java Program To Find 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

The decimal value of an empty linked list is considered as 0.

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

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

Output :

Decimal value is 11

Time Complexity: O(n) where n is the number of nodes in the given linked list.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

Please refer complete article on Decimal Equivalent of Binary Linked List for more details!