gistfile1.txt

//  create a list of flags
std::vector<bool> flags;
for(int i = 0; i < 10; i++)
  flags.push_back(false);

//  set some flags
flags[1] = true;
flags[3] = true;
flags[4] = true;
flags[8] = true;

// print flags
int counted = 0;
for(int i = 0; i < 10; i++) {
  if(counted%4 == 0) std::cout << std::endl;
  if(flags[i]) {
    std::cout << "Flag" << i << " set.";
    counted++;
  }
}

In response to http://stackoverflow.com/questions/14691177/c-programming