1290. Convert Binary Number in a Linked List to Integer.cpp

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
    int getDecimalValue(ListNode* head) {
        int result=0;
        while(head!=NULL)
        {
           result=(result*2)+head->val;
           head = head->next;
        }
        return result;
        
    }
};