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

int main()
{
	for (;;) {   //infinite loop, until we break out of it below
		cout << "Please type an integer in hexadecimal: ";
		int i {0};
		cin >> hex >> i;   //iomanipulator works for input, too

		if (!cin) {    //If the user typed something other than an int,
			break; //out of the for loop
		}

		cout << uppercase << hex << i << " in hexadecimal is "
			<< dec << i << " in decimal.\n";
	}

	return EXIT_SUCCESS;   //Arrive here when we break out of the loop.
}