#include <iostream>
#include <cstdlib>
using namespace std;

struct str {
	int i;
	double d;
};

int main()
{
	str a[] = {
		{10, 10.0},
		{20, 20.0},
		{30, 30.0}
	};
	const size_t n = sizeof a / sizeof a[0];

	for (size_t i = 0; i < n; ++i) {
		cout << a[i].i << ", " << a[i].d << "\n";
	}

	cout << "\n";

	for (str *p = a; p < a + n; ++p) {
		cout << p->i << ", " << p->d << "\n";
	}

	return EXIT_SUCCESS;
}