#include <iostream>
#include <bitset>

union U
{
  unsigned int i;
  unsigned char byte[4];
};

int main()
{
  union U u;
  u.i = 0b00001000'00001001'00001011'00001111;
  std::cout << std::bitset<8>(u.byte[0]) << std::endl
            << std::bitset<8>(u.byte[1]) << std::endl
            << std::bitset<8>(u.byte[2]) << std::endl
            << std::bitset<8>(u.byte[3]) << std::endl;
}