// p03_07.cpp: Storing four nonnegative integers of four bits

// in a short int

#include <iostream>

using namespace std;



int main() {

int a0, a1, a2, a3, i;

short int x;

cout << "Enter four nonnegative integers "

        "a0, a1, a2, and a3,\n"

        "each less than 16:\n";

cin >> a0 >> a1 >> a2 >> a3;

x = a3 << 12 | a2 << 8 | a1 << 4 | a0;

cout << "Enter 0, 1,2, or 3 to retrieve the first,\n"

        "second, third, or fourth of these integers:\n";

cin >> i;

int nShift = 4*i;

int ai = (static_cast<unsigned int>(x) >> nShift) & 0xF;

cout << "Retrieved: " << ai << endl;

return 0;

}