Bit shifter

#include <stdarg.h>

void printf(char *fmt, ... ){
        char tmp[128]; // resulting string limited to 128 chars
        va_list args;
        va_start (args, fmt );
        vsnprintf(tmp, 128, fmt, args);
        va_end (args);
        Serial.print(tmp);
}

void setup(){
  Serial.begin(9600);
}

void loop(){
  byte a = 0x55;
  byte b = 0x79;
  Serial.print("A = 0x");
  Serial.println(a,HEX);
  Serial.print("Left shifted by one: 0x");
  Serial.println((a << 1),HEX);
  Serial.print("Right shifted by one: 0x");
  Serial.println((a >> 1), HEX);
  Serial.print("0x");
  Serial.print(a,HEX);
  Serial.print(" AND 0x");
  Serial.print(b,HEX);
  Serial.print(" = 0x");
  Serial.println((a & b),HEX);
  while(1){}
  printf("Left shifted by one: %02x\n",(a << 1));
  printf("Right shifted by one: %02x\n",(a >> 1));
  printf("%02x AND %02x = %02x\n", a, b, (a&b));

}