list

#include <stdlib.h>
#include <stdio.h>

struct listNode
{
    int value;
    struct listNode *next;
};

struct listNode *addToList(struct listNode *p, int v)
{
    if (p == NULL)
    {
        p = malloc(sizeof(struct listNode));
        p->value = v;
        p->next = NULL;
    }
    else
    {
        p->next = addToList(p->next, v);
    }
    return p;
}

void printList(struct listNode *p)
{
    while (p != NULL)
    {
        printf("%d\n", p->value);
        p = p->next;
    }
}

int main()
{
    FILE *f = fopen("in.txt", "r");
    int v;
    struct listNode *root = NULL;
    while (fscanf(f, "%d\n", &v) != EOF)
    {
        root = addToList(root, v);
    }

    printList(root);

    fclose(f);
    return 0;
}