very important ---- set bit pattern

void printBits(unsigned int V){
  for(int i=sizeof(unsigned int)*8-1;i>=0;!((i+1)%4) && putchar(' '),putchar('0' + !!(V & (1<<i))), (!i) && putchar('\n'),i--);
}
void SetBitPattern(unsigned int& val, const char* bitPattern, int startBitIndex){
  int i = -1;
  while(bitPattern[++i]);
  while(i--){
    if(bitPattern[i]-'0'){
      val = val | 1 << startBitIndex;
    }
    else{
      val = val & ~(1 << startBitIndex);
    }
    startBitIndex++;
  }
}