What will be the output of the following code snippet for the list 1->2->3->4->5->6?def fun(start): if start is None: return print(start.data, end=" ") if start.next is not None: fun(start.next.next) print(start.data, end=" ")Options2 4 6 1 3 51 3 5 5 3 11 2 3 4 5 61 3 5 1 3 5
Question
What will be the output of the following code snippet for the list 1->2->3->4->5->6?def fun(start): if start is None: return print(start.data, end=" ") if start.next is not None: fun(start.next.next) print(start.data, end=" ")Options2 4 6 1 3 51 3 5 5 3 11 2 3 4 5 61 3 5 1 3 5
Solution
The output of the given code snippet will be "1 3 5 5 3 1".
Here's the step by step explanation:
-
The function
fun()is a recursive function that prints the data of the nodes of a linked list. -
The base case of the recursion is when the
startnode isNone, in which case the function returns without printing anything. -
If the
startnode is notNone, the function first prints the data of thestartnode. -
Then, if the next node of the
startnode is notNone, the function calls itself with the node two steps ahead of thestartnode as the argument. -
After the recursive call, the function prints the data of the
startnode again. -
For the linked list 1->2->3->4->5->6, the function is initially called with the first node (with data 1) as the argument.
-
The function prints "1 ", then calls itself with the third node (with data 3) as the argument.
-
The function prints "3 ", then calls itself with the fifth node (with data 5) as the argument.
-
The function prints "5 ", then calls itself with
Noneas the argument. -
Since the argument is
None, the function returns without printing anything. -
The function then prints "5 " again, and returns to the previous call.
-
The function then prints "3 " again, and returns to the previous call.
-
Finally, the function prints "1 " again, and returns to the original call.
So, the output of the code snippet is "1 3 5 5 3 1".
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