#include <stdio.h>

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

	printf("size: %lu\n", sizeof(*(1 ? (void*)(i * 0ul) : (int*)1)));
	printf("size: %lu\n", sizeof(*(1 ? (void*)(5 * 0ul) : (int*)1)));
}

/*
$ gcc -Wall const.c && ./a.out
size: 1
size: 4
*/