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

int main()
{
	int a[] = {20, 10, 50, 30, 40};
	const size_t n = sizeof a / sizeof a[0];

	for (int *end = a + n - 1; a < end; --end) {
		for (int *p = a; p < end; ++p) {
			if (p[1] < p[0]) {   //if p[0] and p[1] in wrong order,
				const int temp = p[0];   //swap them
				p[0] = p[1];
				p[1] = temp;
			}
		}
	}

	for (int *p = a; p < a + n; ++p) {
		cout << *p << "\n";
	}

	return EXIT_SUCCESS;
}