#include <library.h>

void print_in_binary(int N, unsigned int mask)
{ if (mask == 0)
    return;
  if ((mask & N) == 0)
    cout << "0";
  else
    cout << "1";
  print_in_binary(N, mask >> 1); }

void print_in_binary_no_zeros(int N, unsigned int mask)
{ if (mask == 0)
  { cout << "0";
    return; }
  if ((mask & N) == 0)
    print_in_binary_no_zeros(N, mask >> 1);
  else
  { cout << "1";
    print_in_binary(N, mask >> 1); } }

void print_in_binary(int N)
{ print_in_binary_no_zeros(N, 0x80000000); }

int main()
{ cout << "Enter a number: ";
  const int x = read_int();
  print_in_binary(x);
  cout << "\n"; }