/* Adds contents of two linked lists and return the head node of resultant list */
static Node addTwoLists(Node first, Node second) {
Node res = null; // res is head node of the resultant list
Node temp = null, prev = null;
int carry = 0, sum, i = 0;
while (first != null || second != null) // while both lists exist
{
// Calculate value of next digit in resultant list.
// The next digit is sum of following things
// (i) Carry
// (ii) Next digit of first list (if there is a next digit)
// (ii) Next digit of second list (if there is a next digit)
sum = carry + (first != null ? first.getData() : 0) + (second != null ? second.getData() : 0);
// update carry for next calulation
carry = (sum >= 10) ? 1 : 0;
// update sum if it is greater than 10
sum = sum % 10;
// Create a new node with sum as data
temp = new Node(sum);
// if this is the first node then set it as head of the resultant list
if (res == null) res = temp;
else // If this is not the first node then connect it to the rest.
prev.setNext(temp);
// Set prev for next insertion
prev = temp;
// Move first and second pointers to next nodes
if (first != null) first = first.getNext();
if (second != null) second = second.getNext();
}
if (carry > 0) temp.setNext(new Node(carry));
// return head of the resultant list
return res;
}
/*
* Add two numbers represented by linked lists | Set 1
Given two numbers represented by two lists, write a function that returns sum list. The sum list is list representation of addition of two input numbers.
Example 1
Input:
First List: 5->6->3 // represents number 365
Second List: 8->4->2 // represents number 248
Output
Resultant list: 3->1->6 // represents number 613
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Node first = new Node(1);
// Node temp = new Node(2);
// Node temp2 = new Node(3);
// temp.setNext(temp2);
// first.setNext(temp);
Node second = new Node(4);
Node five = new Node(5);
Node six = new Node(6);
five.setNext(six);
second.setNext(five);
Node res = addTwoLists(first, second);
while (res != null) {
System.out.println(res.getData() + ">");
res = res.getNext();
}
}
