why doesnt this work:

Code:
#include "stdafx.h"
#include "iostream"

using namespace std;

int main(int argc, char* argv[])
{
	int i;
	char letter;
	char option[2];
	int x;
	do
	{
		cout << "Enter a Number: ";
		cin >> i;
		letter = i;
		cout << "\nNumber you entered: " << i;
		cout << "\nEquivalent Letter: " << letter;
		cout << "\nRestart from beginning? (Y for Yes, N for No): ";
		cin >> option;
		if(option == "N")
		{
			return 0;
		}
	}while(option != "N");
	
}