#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#define MAXELEMENTS 20

struct  node_t {
    int value;
    double dvalue;
    struct node_t * next;
};
typedef struct node_t NODE;


int gnums[MAXELEMENTS];

int main(int argc, char ** argv)
{
  int numelements;
  int val;
  int i;
  int retval;
  int * nums;
  NODE * head = NULL;
  NODE * tail = NULL;
  NODE * node;
  
  printf("Enter number of elements: ");
  retval = scanf("%d", &numelements);
  assert(numelements >= 0 && numelements <= MAXELEMENTS);
  
  nums = (int *)malloc(numelements * sizeof(int));
  for (i = 0; i < numelements; i++) {
    printf("%4d: ", i);
    retval = scanf("%d", &val);
    gnums[i] = val;
    nums[i] = val;
    node = (NODE *)malloc(sizeof(NODE));
    if (head == NULL) {
      head = node;
      tail = node;
    } else {
      tail->next = node;
    }
    node->value = val;
    node->dvalue = (double)val;
    node->next = NULL;
  }
}