CODEWITHSUNDEEP
cfunctionpointersrecursion
user1005284
user1005284

Reputation:

How does this print function moves pointer to next item in the linked list?

struct ll {
    int num;
    struct ll *next;
};

struct ll *head;

main() {
    /* code to assign head pointer some memory */

    print(head->next);
}

I read that the print() function in above code moves the poiner to next item. How does this move the head pointer to next item?

Upvotes: 0

Views: 171

Answers (2)

Blastfurnace
Blastfurnace

Reputation: 18652

Your head pointer is a global and you don't want to alter it while simply traversing the list. This will walk through the list and print each num field.

void print(struct ll *node) {
    while (node) {
        printf("%d\n", node->num);
        node = node->next;
    }
}

main() {
    /* code to assign head pointer some memory */
    print(head);
}

Upvotes: 1

blahdiblah
blahdiblah

Reputation: 34031

print() must look something like:

print(struct ll *foo) {
  // code
  head = head->next;
  // other code
}

Note that this is not good code in a variety of ways, but that's how it would move head to point to the next item.

Upvotes: 2

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