#include <stdio.h>

void f(int arr[]) // == void f(int *arr)
{
	size_t size = sizeof(arr);

	printf("Size in f(): %d\n", size);
}

void main()
{
	int arr[] = { 10, 20, 30 };
	size_t size = sizeof(arr);

	printf("Size in main(): %d\n", size);
	f(arr);
}