#include <iostream>
#include <iomanip>

int main()
{
  int a=0xff;
  int b = 0xaa000;
  int c , d;
  c = 0x1 << 3;
  d = 0x1 << 2;
  d |= 0x1 << 12;
  std::cout<<std::hex<< a <<" , "<< b <<" , "<< c <<" , "<< d <<std::endl;

  c = 0x1 << 7;
  b |= a;  // or_eq
  std::cout<<std::hex<< a <<" , "<< b <<" , "<< c <<" , "<< d <<std::endl;

  b &= a;  // and_eq
  d &= a;  // and_eq
  std::cout<<std::hex<< a <<" , "<< b <<" , "<< c <<" , "<< d <<std::endl;

  return 0;
}

$ ./a.exe
ff , aa000 , 8 , 1004
ff , aa0ff , 80 , 1004
ff , ff , 80 , 4