/*Aleksi Kuznetsov, 0508819, 13.2.2018*/

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

void do_change(int *pnumbers);

void do_print(int *pnumbers);

int main(void)  {

  int do_this;
  int numbers[0];
  int *pnumbers = numbers;
  int amount = 0;
  int *pamount = &amount;

  while (1) {
    printf("%d) Tulosta taulukon alkiot\n%d) Muuta taulukon kokoa\n%d) Lopeta\n", 1, 2, 0);
    printf("Anna valintasi: \n");
    scanf("%d\n", &do_this);

    if (do_this == 1) {
        do_print(numbers);
    } else if (do_this == 2) {
        do_change(numbers);
    } else if (do_this == 0) {
        break;
    }
  }

  printf("Kiitos ohjelman käytöstä.\n");
  free(pnumbers);
  pnumbers = NULL;

  return 0;
}

void do_change(int *pnumbers) {

  printf("Anna taulukon uusi koko: \n");
  scanf("%d\n", &amount);

  pnumbers = malloc(amount*sizeof(int));

  if (pnumbers == NULL) {
      perror("rip");
      exit(1);
  } else {
      for (int i=0; i<amount; i++)
        pnumbers[i] = i;
  }
return;
}

void do_print(int *pnumbers) {
  for (int i=0; i<amount; i++)
     printf("%d ", pnumbers[i]);
return;
}