link.c

/* Linked list example */

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

typedef struct Node { 
    int data;
    struct Node *next;
} Node;

void add_node(Node *node, int data) { 
    /* Traverse to last node */
    if (node != 0) { 
        while (node->next != 0) { 
            node = node->next;
        } 
    } 
    /* Allocate memory space for the new node */
    node->next = malloc(sizeof(Node));
    node = node->next;
    node->next = 0;
    node->data = data;
}

int main(void) { 
    Node *head;

    head = malloc(sizeof(Node));
    head->next = 0;
    head->data = 12;

    add_node(head, 24);
    add_node(head, 36);

    Node *node;
    node = head;
    while (node !=0) {
        printf("%d\n", node->data);                                                                                  
        node = node->next;
    } 
}