/*
 * Read some integers into an vector, then echo them, using iterators.
 */
#include <iostream>
#include <vector>

using std::cin;
using std::cout;
using std::endl;

int main()
{
	// Read them in.
	std::vector<int> vec;
	cout << "Enter some integers: " << endl;
	int val;
	while(cin >> val) {
		vec.push_back(val);
	}

	// Print them back out again.  (Note: I could declare scan with auto
	// and save a lot of typing, but I wanted you to see the type name.)
	cout << "===============" << endl;
	for(std::vector<int>::iterator scan = vec.begin(); scan < vec.end(); ++scan) {
		cout << *scan << " ";
	}
	cout << endl;

	// Array iterators can be compared, the result reflecting their
	// position, and they can incremented by numbers other than 1.
	// Here, we go up the even-numbered ones, and back down odd-numbered
	// ones.
	auto scan = vec.begin();
	while(scan < vec.end()) {
		cout << *scan;
		scan += 2;
		if(scan < vec.end()) {
			cout << " ";
		}
	}

	std::string sep = "|";
	for(scan = vec.begin() + 1; scan < vec.end(); scan += 2) {
		std::cout << sep << *scan;
		sep = " ";
	}
	cout << "\n===============" << endl;
}