C: Largest number, wrong output. rand()

This program creates random numbers using rand(). The user inputs how many random numbers will be created as an integer. The program also finds the largest number.

This is my code:

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

  int main(void)
{
  srand(time(NULL));
  int size;
  int i;
  int array[0];

  printf("\nSize of random array: ");
  scanf("%d", &size);

  for (i = 0; i <  size; i++){
    array[i] = rand() % 100 + 1;;
  }

  for (i=0; i < size; i++){
       printf("%d ", array[i]);
      }

 int largest =0;

for (i = 1; i < size; i++)
{
      if (largest < array[i])
              largest = array[i];
      }
printf("\n largest element present in the given array is : %d\n", largest);

    return 0;
}

I'm using an online C compiler. (I was using Atom editor but my code doesn't do anything in there). The output should be something like this:

Size of random array: 6
0 6 10 21
largest element present in the given array is : 21

But I'm getting this:

Size of random array: 6
0 6 0 0 -433525051 32757
largest element present in the given array is : 32757

Why do I'm getting such a big numbers? how can I fix this?