Arduino binary to decimal using bit shift

arduino bitshift BCD 20210102.ino

int a,b,c,d;
int i;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for(i = 0; i < 16 ; i++)
  {
    a = i      & 0x01;
    b = i >> 1 & 0x01;
    c = i >> 2 & 0x01;
    d = i >> 3 & 0x01;
    Serial.print(a);Serial.print(" ");
    Serial.print(b);Serial.print(" ");
    Serial.print(c);Serial.print(" ");
    Serial.print(d);Serial.println(" ");
  }
}

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

}