List.c

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

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

void displayList(struct Node* n){
    while(n != NULL){
        printf("%d ", n->data);

        n = n->next;
    }
    printf("\n");
}

int main(){
    struct Node* head = NULL;
    struct Node* second = NULL;
    struct Node* third = NULL;
    struct Node* fourth = NULL;

    head = (struct Node*)malloc(sizeof(struct Node));
    second = (struct Node*)malloc(sizeof(struct Node));
    third = (struct Node*)malloc(sizeof(struct Node));
    fourth = (struct Node*)malloc(sizeof(struct Node));

    head->data = 10;
    head->next = second;

    second->data = 20;
    second->next = third;

    third->data = 30;
    third->next = fourth;

    fourth->data = 40;
    fourth->next = NULL;

    displayList(head);

    return 0;
}