uint8_t getBit(uint16_t val, uint8_t pos) {
  return ((val >> (pos * 4)) & 0xF);
}

void setup() {
  Serial.begin(9600);
  uint16_t x = 0b0000000000000000;
  uint16_t num = 1000;
  uint8_t val = 4;
  //x |=  (1 << 15); // set bit 8 -> 256
  x |= 1024;
  x |= val;
  //x &= 0x08;
  //x |=  (1 << 7);
  
  //y = y & 0xFF;

  Serial.print(x); Serial.print(" -> "); Serial.println(x, BIN);
  for (int i=16; i-->0;)
    Serial.print(i), Serial.print(": "), 
    Serial.println((x & (1 << i)) ? "1" : "0");
    //Serial.print(i), Serial.print(": "), Serial.println( getBit(x, i));

  for (int i=12; i-->0;) {
    Serial.print(i); Serial.print(" 0x"); Serial.println(i, HEX);
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}