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

void print(int start, int end, int stride);

int main()
{
	print(4, 12, 2);   //Print the even integers from 4 to 12 inclusive.
	return EXIT_SUCCESS;
}


//Print the integers from start to end inclusive by stride's.

void print(int start, int end, int stride)
{
	if (start > end) {
		cerr << "start " << start << " can't be bigger than end " << end
			<< "\n";
		exit(EXIT_FAILURE);
	}

	if (stride <= 0) {
		cerr << "stride " << stride << " must be positive\n";
		exit(EXIT_FAILURE);
	}

	cout << start << "\n";

	if (start < end) {
		print(start + stride, end, stride);
	}
}