// Print out a list of powers of 2.
#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    const int UPPER_LIMIT = 100;
    int num = 1;    // counter
    char choice;    // used to get user input

    while (num <= UPPER_LIMIT)
    {
        cout << "2 to the " << num << " power is " << pow(2, num) << endl;
        cout << "Should I go on? [y/N]: ";
        cin >> choice;
        if (choice == 'N' || choice == 'n')
            break;    // (try replacing with 'continue')
        num++;
    }

    cout << "Goodbye!" << endl;
    return 0;
}