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

int main(void) {
  int num_elements = 5;
  
  int my_data[10] = {1, 2, 3, 4, 5...}

  

  // allocating 5 * 8 bytes on the heap
  // returns the address of the heap where the alloc was
  int *data = malloc(num_elements * sizeof(int));
  
  num_elements += 40;

  data = realloc(data, num_elements * sizeof(int));
//   free(data);
}