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

struct data {
    int value;
    struct data *next; // define as pointer, why dont we just type data *next?
} *head, *node; // init as a pointer

void push(int x) {
    // when push is called, malloc will allocated new memory block!
    node = (struct data *) malloc(sizeof(struct data));
    node->value = x;

    if (head == NULL) {
        head = node;
        head->next = NULL;
    } else {
        // save the newer node as head, and set older node->next to head
        node->next = head;
        head = node;
    }
}

void view() {

}

int main() {
    // because *head is a pointer, its should contain memory address (& in primitive data types)
    // head = (struct data *) malloc(sizeof(struct data)); // same concept as (int *) malloc(sizeof (int))
    // head->value = 5; // access pointer struct attr using (->) instead of (.)

    push(50);
    push(25);

    printf("%d\n", head->value);



    return 0;
}