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#include <stdio.h>


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


int main() {

    struct Node* node1;
    node1 = malloc(sizeof(struct Node));
    node1->data = 30;
    node1->next = NULL;

    printf("%d ", node1->data);

    struct Node* node2;
    node2 = malloc(sizeof(struct Node));
    node2->data = 40;
    node2->next = NULL;

    node1->next = node2;
    printf("%d ", node2->data);

    struct Node* node3;
    node3= malloc(sizeof(struct Node));
    node3->data = 50;
    node3->next = NULL;

    node2->next = node3;

    printf("%d\n", node3->data);


    struct Node* head = node1;
    head->data = 100;

    printf("%d", node1->data);


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

    printLinkedList(head);
    printf("\n===================\n");
    printLinkedListWhileLoop(head);

    printf("\n===================\n");
    
    insert(head, 10);

}

void insert(struct Node* head, int data){
    //TODO
}



void printLinkedList(struct Node* head){
    if(head == NULL){
        return;
    }

    printf("%d ", head->data);
    struct Node* node2 = head->next;

    if(node2 == NULL){
        return;
    }

    printf("%d ", node2->data);

    struct Node* node3 = node2->next;
    if(node3 == NULL){
        return;
    }

    printf("%d ",node3->data);
    node3->data = 60;
    printf("\n%d ",node3->data);

    struct Node* node4 = node3->next;
    if(node4 == NULL){
        return;
    }
    printf("%d ",node4->data);

}

void printLinkedListWhileLoop(struct Node* head){
    struct Node* node = head;
    while(node != NULL){
        printf("%d ", node->data);
        node = node->next;
    }
}