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#include <stdio.h>

struct ListNode
{
    struct ListNode *next;
    char            id;
};

struct ListNode c, a, b;

int printList(const struct ListNode *listNode);

int
main(void)
{
    a.id = 'a';
    a.next = &b;

    b.id = 'b';
    b.next = &c;

    c.id = 'c';
    c.next = 0;

    printList(&a);

    putchar('\n');
}

int
printList(const struct ListNode *listNode)
{
    for (; listNode; listNode = listNode->next) {
        putchar(listNode->id);
    }

    return 1;   // because we need to return something
}