#include <stdio.h>
    struct p
    {
        struct p *next;
        int n;
    };
    int main()
    {
        struct p *ptr1 = calloc(1, sizeof(struct p));
        ptr1->n = 1;
        ptr1->next = calloc(1, sizeof(struct p));
        printf("%d\n", ptr1->next->n);
        return 0;
    }