cm

1) Array parameters are always passed as pointers, even when we use square brackets.
2) https://www.geeksforgeeks.org/references-in-c/
3) https://www.geeksforgeeks.org/void-pointer-c/
4) https://www.geeksforgeeks.org/function-pointer-in-c/
#include <stdio.h>

int fun(int ptr[])
{
   int x = 10;

   // size of a pointer is printed
   printf("sizeof(ptr) = %d\n", sizeof(ptr));

   // This allowed because ptr is a pointer, not array
   ptr = &x;

   printf("*ptr = %d ", *ptr);

   return 0;
}
int main()
{
   int arr[] = {10, 20, 30, 40, 50, 60};
   fun(arr);
   return 0;
}