#include <iostream>
#include <cstdlib>
#include <vector>    //for class vector
using namespace std;

int main()
{
	vector<int> v {0, 10, 20, 30};  //subscripts go from 0 to 3 inclusive

	try {
		for (int i {0}; i < 5; ++i) {
			cout << v.at(i) << "\n";   //cout << v[i] wouldn't throw
		}
	}

	catch (out_of_range& oor) {
		cerr << "An exception was thrown, carrying bad news:\n";
		cerr << oor.what() << "\n";
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;   //Arrive here if no exception was thrown.
}