Not sure why this doesn't cause an error.

array.c

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

int main(int argc, char const *argv[]) {

  int *my_array = malloc(sizeof(int));
  my_array[0] = 3;
  my_array[1] = 4;

  printf("%d, %d\n", my_array[0], my_array[1]);
  
  free(my_array);
  return 0;
}

/* Produces: 3, 4. */