12. Inserting the Data at the Beginning of Single Linked List.c

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

struct node{
    int data;
    struct node *link;
};

struct node *add_beg(struct node *head,int d){

    struct node *ptr = malloc(sizeof(struct node));
    ptr -> data = d;
    ptr -> link = NULL;

    ptr -> link = head;
    head = ptr;
    return head;

}

int main(){

    struct node *head = malloc(sizeof(struct node));
    head -> data = 45;
    head -> link = NULL;

    struct node *ptr = malloc(sizeof(struct node));
    ptr -> data = 60;
    ptr -> link = NULL;
    head -> link = ptr;

    int d = 3;

    head = add_beg(head,d);

    ptr = head;
    printf("Data: ");

    while(ptr != NULL){

        printf("%d ", ptr -> data);
        ptr = ptr -> link;

    }

return 0;
}