Simple linked lists pointer question

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What does this line of code do?

C

p->next->next

what about this one:

C

p->next->data

SOrry if i did anything wrong 1st time.

Posted 4-Jun-13 3:14am

iiREDii

Updated 4-Jun-13 13:11pm

NotPolitcallyCorrect

v2

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Abhinav S · Answer 1 · 2013-06-04T03:29:00

Solution 1

p->next->next

In this case we are traversing the linked list.
We are basically navigating two link nodes.

p->next->data

Here, we are navigating to the next linked list node and then accessing its data value.

Posted 4-Jun-13 3:29am

Abhinav S

Comments

iiREDii 4-Jun-13 9:38am

i made a drawing:http://i39.tinypic.com/a9lpva.png so using that pic tell me where do these 2 lines take me if at first the pointer is at the head of the list.
P.S:dont laugh at my drawing skillz please......

CPallini 4-Jun-13 10:52am

My 5.

Abhinav S 4-Jun-13 22:27pm

Thanks.

[no name] 7-Jun-13 1:13am

My too 5.

Abhinav S 7-Jun-13 5:49am

Thank you.

CPallini · Answer 2 · 2013-06-04T03:42:00

Solution 2

Quote:
p->next->next

See it as a two-steps operation:

C

p->next

gives you the pointer to the next element of the list, then

C

(p->next)->next

gives you the pointer to the element immediately following the next, that is the pointer to the item 'at distance 2'.

Quote:
p->next->data

With a similar argument, you may write

C

(p->next)->data

showing you are accessing the data member of the next element of the list.

Posted 4-Jun-13 3:42am

CPallini

Comments

Abhinav S 4-Jun-13 9:45am

5.

iiREDii 4-Jun-13 10:37am

yeah thats where normal logic took me,look at the pic i posted on solution 1 below could you do another pic using arrows to explain me where do both lines take you to?