Problem with code

Question

I think that the output of the program should be
4 5 6 7 but the output is
5 4 6 7
please explain this?
https://code.sololearn.com/cE5S4zkA6g42/?ref=app
https://code.sololearn.com/cE5S4zkA6g42/?ref=app

Answer 1

You put 4 at the start.
You put 5 at the start so 4 is now second.
You put 6 at end so it follows 4.
You put 7 at end so it follows 6.

You should either remove tail or make use of it. If you update it correctly, put at end can lose the loop as tail has the last item of the list.

Answer 2

linkedList a; //empy list
a.addNodeAtStart(4); // adds 4
list -> 4
a.addNodeAtStart(5); // adds 5 to start
list -> 5, 4
a.addNodeAtEnd(6); // adds 6 to end
list -> 5, 4, 6
a.addNodeAtEnd(7); // adds 7 to end
list -> 5, 4, 6, 7
a.display();

Answer 3

Thanks .. i messed up the logic