kr03-4main.c

#include <stdio.h>
#include <string.h>

struct Elem
{
    struct Elem *next;
    char *str;
};

struct Elem *dup_elem(struct Elem *head);

int main(void)
{
    struct Elem *head = calloc(1, sizeof(*head));  // "10" "5x" "alpha" " -03"
    head->str = calloc(100, sizeof(*head->str));
    strcpy(head->str, "10");

    head->next = calloc(1, sizeof(*head));  // 5x" "alpha" " -03"
    head->next->str = calloc(100, sizeof(*head->str));
    strcpy(head->next->str, "5x");

    head->next->next = calloc(1, sizeof(*head));  // "alpha" " -03"
    head->next->next->str = calloc(100, sizeof(*head->str));
    strcpy(head->next->next->str, "alpha");

    head->next->next->next = calloc(1, sizeof(*head));  // " -03"
    head->next->next->next->str = calloc(100, sizeof(*head->str));
    strcpy(head->next->next->next->str, " -03");

    head->next->next->next->next = NULL;

    for (struct Elem *current_elem = head; current_elem; current_elem = current_elem->next;) {
        printf("[%s]%s", current_elem->str, current_elem->next ? " -> " : "\n");
    }

    printf("\n");
    head = dup_elem(head);
    printf("\n");

    for (struct Elem *current_elem = head; current_elem;) {
        printf("[%s]%s", current_elem->str, current_elem->next ? " -> " : "\n");
        struct Elem *tmp = current_elem;
        current_elem = current_elem->next;
        free(tmp->str);
        free(tmp);
    }
}